I'd love to see you tackle a full doppler plug-in. There are very few of them available and your plug-ins would afford so much flexibility in this field. I know you can use the MMultiBandVibrato and MRotary plug-ins, but you really can't recreate the full range of doppler effects with these, it's just not quite cut out for this purpose. Exaggerated pitch changes, filter changes, specific paths, etc aren't replicated in your existing plugs.
I know this doesn't have a great deal of music use, it's more for sound design/effects, but I know you could make a plug-in that would beat the pants off of the existing ones and it wouldn't be terribly difficult to do as it's not THAT different to what you currently have available.
For reference, the waves doppler is the sort of 'standard' doppler most people use and is mega old now:
http://www.waves.com/plugins/doppler
and this one was recently released as freeware is also pretty solid:
http://aegeanmusic.com/doppler-dome-specs
For clarity, doppler does not pitch shift using the granular or vocoder based methods, but would slow down and speed up the playback speed to create true doppler effects. That way you dont get any processing artifacts as it's not chopping the sound up.
I know people have asked you for this before, but I thought I'd ask again just as a long shot!
Thanks and keep up the good work
