I fear this can't be done. The filter envelope always works the same way, but you can configure your midi macros as you want, you can map every single value to a different function, and it doesn't even have to be a filter.
That's the problem, AFAIK modplug's default configuration for res filters is Z80 to ZFF, however in IT it's Z80 to Z8F. If I just did this for the default setup, this would confuse people a lot.