I'm updating the DreamShell list of parameters based on the last boot loader released in the Swat Forum.

The games were tested using this DS folder (That needs to be in the root of your SD Card/ide drive):

http://titanide.kinghost.net/Dreamcast/DS.rar

List of parameters:

102 Dálmatas - Async 8, 0x8c004000
18 Wheeler - Async 1, 0x8cfe0000
Advanced Wars 2 - Async 8, 0x8c004000
Alien Front Online - Async 1, 0x8c000100
Alone In The Dark IV - 0x8cfe0000
Another World - Async 8, 0x8c004000
Aqua GT - Async 8, 0x8c004000
Blue Stinger - Async 16, 0x8cef8000
Bomber He He - Async 8, 0x8c004000
BomberMan Online - Async 0, 0x8cef8000
Buggy Heat - Async 8, 0x8c004000
Cannon Spike - Async 1, 0x8c004000
Capcom vs Snk 1 - Async 1, 0x8c004000
Capcom vs Snk 2 - Async 1, 0x8c004000
Carrier - Async 8, 0x8c004000
Cave Story - Async 8, 0x8c004000
Charge And Blast - Async 4, 0x8c004000
Chicken Run - Async 8, 0x8c004000
Chu Chu Rocket! - Async 16, 0x8cfe8000, CDDA
Crazy Taxi - Async 16, 0x8cfe8000
Crazy Taxi 2 - Async 2, 0x8c004000
Dangerous Toys - Async 8, 0x8c004000
Daytona USA - Async 8, 0x8c004000
Dead Or Alive 2 - Async 8, 0x8c004000
Deadly Skies - Async 8, 0x8c004000
Dino Crisis - Async 8, 0x8c004000
Divi Dead - Async 8, 0x8c004000
Doom Collection - Async 8, 0x8c004000
Draconus - Async 8, 0x8c004000
DUX - Async 8, 0x8c004000
Dynamite Cop - CDDA, 0x8cfe8000
Ecco The Dolphin - Async 8, 0x8c004000
Elemental Gimmick Gear - Async 8, 0x8c000100
Evil Dead Hail To The King - Async 8, 0x8c004000
Evil Twin - Async 2, 0x8c000100
Evolution The World of Sacred Device - Async 8, 0x8c004000
Exhibiton of speed - Async 8, 0x8c004000
Expendable - Async 16, 0x8cfe8000, CDDA
European SuperLeague - Async 8, 0x8c004000
F355 Challenge - Async1, 8x8cfe0000
Fighting Force 2 - Async 8, 0x8c004000
Fighting Vipers - Async 8, 0x8c004000
Final Fight Apocalypse - Async 8, 0x8c004000
Flag to Flag - Async 16, 0x8cef8000, CDDA
Flashback - Async 8, 0x8c004000
Frame Gride - Async 8, 0x8c004000
Gaunlet Legends - Async 8, 0x8c004000
GTA 2 - Async 8, 0x8c004000
Head Hunter - Async 8, 0x8c004000
Heavy Metal Geomatrix - Async 8, 0x8c004000
Jedi Power Battles - Async 8, 0x8c004000
Jet Set Radio - Async 8, 0x8c004000
Last Blade 2 - Async 8, 0x8c004000
Maken X - Async 8, 0x8c004000
Monaco Grand Prix 2 Online - Async 16, 0x8cfe8000
Mars Matrix - Async 8, 0x8c004000
Marvel vs Capcom 2 - Async 1, 0x8cff6000
Mortal Kombat Gold - Async 16, 0x8cef8000, CDDA
Mr. Driller - Async 8, 0x8c004000
MTV SkateBoarding - Async 8, 0x8c004000
NBA Hoopz - Async 8, 0x8c004000
Nomad Soul - Async 8, 0x8c004000
Pen Pen Triathlon - Async 8, 0x8c004000
Phantasy Star Online v2 - Async 1, 0x8cef8000
Planet Ring - Async 8, 0x8c004000
Power Stone 2 - Async 8, 0x8c004000
Project Justice - Async 1, 0x8c004000
Propeller Arena - 0x8cfd0000
Quake 3 - Async 8, 0x8c004000
Quake - Async 8, 0x8c004000
Record Of Lodoss War - 0x8cfe0000
Red Dog - Async 8, 0x8c004000
Resident Evil 3 - Async 8, 0x8c004000
Resident Evil Code Veronica - Async 8, 0x8c004000
Rippin Riders - Async 8, 0x8c004000
Rise Of The Triad - Async 8, 0x8c004000
Roadsters - Async 8, 0x8c004000
Sega GT - Async 4, 0x8c004000
Shenmue 1 - Async 1, 0x8cfe80000
Silver - Async 8, 0x8c004000
Skies Of Arcadia - Async 8, 0x8c004000
Snow Surfers - Async 8, 0x8c004000
Sonic Adventure - Async 1, 0x8cfe0000
Sonic Adventure 2 - Async 8, 0x8cef8000
Soul Fighter - Async 8, 0x8c004000
South Park Rally - Async 8, 0x8c004000
Spawn - Async 8, 0x8c004000
Spec Ops II - Async 8, 0x8c004000
Speed Devils - Async 8, 0x8c004000, CDDA
Spiderman- Async 8, 0x8c004000
Star Wars Racer - Async 8, 0x8c004000
Street Fighter III 3rd Strike - Async 1, 0x8c004000
Super Magnetic Neo - Async 4, 0x8c004000
Surf Rocket Racers - Async 8, 0x8c004000
Suzuki Alstare - Async 8, 0x8c004000, CDDA
Sword Of the Berserk - Async 8, 0x8c004000
Test Drive Le Mans 24h - Async 4, 0x8c004000
Time Stalkers - Async 8, 0x8c004000
Tokio Xtreme Challenge 2 - Async 4, 0x8c004000
Tokio Xtreme Challenge - CDDA, 0xc0000100
Toy Commander - Async 8, 0x8c004000
Toy Racer - Async 8, 0x8c004000, NO CDDA
TrickStyle - Async 8, 0x8c004000, CDDA
Unreal Tournoument - Async 8, 0x8c004000
Virtua Striker 2 - Async 1, 0x8cfe0000
Virtua Tennis 2 - Async 1, 0x8c004000
Zombie Revenge - Async 16, 0x8cfe8000, CDDA
Zusar vu - Async 8, 0x8c004000


I tested some of the online games using DreamShell + SD Card, here is what I found:

Phantasy Star Online ver 2 - Works really well online but there is an issue where you can't revive other players.
Monaco Grand Prix 2 Online - Works great online, without CDDA.
Quake 3 Arena - Works great online, without CDDA.
Planet Ring - Connects but you can't find other players, the games are always full.
Toy Racer - Connects, you can chat but It freezes when you start a game.
Chu Chu Rocket - Connects, you can chat but when you start a game you go back to the lobby.

Windows CE games don't work on the SD Card, I have to test the online ones on ide.