1.  Not crazy at all.  Great idea; it has come up a number of times.  Here’s just one:

https://www.eventideaudio.com/forums/topic/h90-any-chance-to-see-global-lfo-adsr-in-future/

More & more manufacturers must think so, too.  There are some straightforward methods available now that provide this externally, via MIDI or expression input.

2.  There are a few options that’ll get you a little closer, depending on exactly what you’re after.  Reverse (delay) before Q-Wah, TremoloPan into any dual effect, HarmaDillo into Q-Wah Envelope… stuff like that.

As for the dry mix, have you considered using the Program level Mix with Q-Wah?  Again, that’s going to depend on what else you may be using in the other Preset, Series / Parallel routing, etc.  But it’s something I use all the time for blending, along with algorithm Mix parameters.