There may be a way, but I doubt it somewhat, because AMXX and Metamod work at different levels of abstraction.As far as I know, returning PLUGIN_HANDLED only stops other plugins, not other metamod modules.
There IS the FakeMeta module though. I haven't used it but I know that it lets you use ANY half life engine call. So there may be a way to do it from there?
Anyways, pb password sounds nice

. Much easier than fooling with FakeMeta I'd imagine.