Hi Jens, thank you for reply.
I don't own such configurable +2MB (or so) trapdoor expansion (yet?), but I'm considering my options and thinking about finding and buying one. That would be nice addition to increase number of games preloading under WHDLoad. The only downside in my situation would be removing KCS Power PC Board emulator, which I really like and which gives standard +0.5 MB SLOW/CHIP as well. So maybe I'll opt for installing hardware Kickstart 3.1. to at least regain 0.5 MB from ACA500 fo starters
But if I do manage to get such configurable expansion, I'll be more than happy to test it and share results with You (and the rest) in appropriate thread. Thanks