Here's my opinion on why Winamp reverted to old MilkDrop: I independently located the four problematic MilkDrop presets. I then went to report them with Winamp only to find out they also found them and upgraded from Winamp 5.601 to Winamp 5.61, dropping the four problem presets.
So I would think that is why they reverted.
But back on the topic:
1. foobar buttons can be made to be bigger and foobar does have customizable skins, where do we go to get a nice extended overview of the skins for foobar, are there central place like Winamp has them or are we talking separate forum threads?
2. Once again, if you are saying whichever collection of Winamp MilkDrop presets exists - they can be made to work with foobar, then can foobar independently set MilkDrop to display on a secondary video output at a specific different resolution and frame rate. So that you can use your computer LCD to do whatever you want in front of you and all the while MilkDrop is pulsing out of your video card output #2 independently - at its own resolution and fresh rate and in full screen on output #2?
Remember all of this is available under Winamp's options - I'm still not clear on foobar's customization procedures but it would be tough to be programming scripts for this on foobar if that is the only way to do this with foobar.