I was working on some beats today and found myself wishing for this feature.
I had a bunch of 4 bar, warped percussion loops that I wanted to replace all the individual hits with new samples in Impulse whilst retaining the exact rhythmic pattern. The only way I could manage this was by manually re-programming each pattern into a new midi clip - not a problem, just time consuming (I know I could have done this by creating midi files with Recycle...but I don't have it).
So, it got me thinking. if an audio clip has a warp marker on each hit then a "Warp Marker to Midi Clip" could create a new midi clip with a short midi note in the same place in the bar as it's equivalent warp marker. Obviously there would be no pitch info for the midi notes but even if they defaulted to C3 the notes could be easily moved on to the relevant notes.
Alternatively, this could be taken a step further by being able to Ctrl-Click each warp marker (as you would if you were to 'warp from here') and assign a midi note value (or even BD, Snare, Closed Hat etc) to each warp marker before converting to a midi clip.
Anyway, not sure if I'm the only person that would find this useful but I thought I would make the suggestion.