General GBA questions

Hello everyone; first post so please bear with me.

I've recently discovered the awesome GameBase Amiga and, coupled with WHDRun, it appears to be the most comfortable and easy-to-use Amiga emulation to date.

So far, I've managed to successfully set up and run most of the WHDLoad preinstalls I've tried, but I'm at a loss when it comes to games that don't have the WHDLoad option under Extras.

I understand that GBA is being continuously developed, so future support for more WHDL packs is possible, but what about games that are unlikely to get the WHD treatment? I'm thinking about games that come on multiple adf images, require an additional savedisk to play properly, or were available only as an HD install (the Death or Glory mission disk comes to mind) - how would I go about making these run on GBA?

I'm basically looking for a step-by-step beginners guide of sorts as the documentation that came with GBA didn't really answer those questions, and the wiki at http://gbamiga.elowar.com/wiki/ throws an error.

I'd be glad if you could point me in the right direction or possibly even clear up some of the issues I mentioned above.

Thanks in advance.