In fact, the module you uses run a special build based on mame32 plus 0.102 .
In addition the module don't run mame32p , but mamep.exe which is the command line version. (it is better to use that one from external front end).
Now, if your galaga roms does not work , it is may be a question of romset version.
Did you use some tools like clrmame or romcenter to check (and correct) roms according to mame version?
You can of course say atomic to use a specific version of mame for a given game , but i think in your case you shouldn't need to do that.
If you didn't manage to fix your problem , send me your rom, i will check.
FYI, Atomic has a English forums for support. If you want you can use it to ask this kind of question. It will centralize all Atomic technical question. (can be found on forums of :
http://www.ArcadeFever.net)