here are our ideas about how to design live with built-in midi seq.:
Session View: we think it would be great to have not only audio tracks, but also midi tracks where you can launch midi clips as same as audioz.
In the track´s preferences you can set a basic out channel(like setting audio out channel) or even link it to vst-instruments, and also midi-in for recording some midi-shit.
In the clip you must be viewed a small midi note editor with a keypad on the side (like cubase,...) where you can write your clip and define the lenghts of it. It must have also have start /stop/warp marker like audio clips and transpose and so on, and somewhere on the left side you can make settings for its midi out channel/port.
Arranger: midi-tracks can be edited as audio tracks with the difference that you´ll see your midi - editor. Your clips can be build as midi-events to arrangement, like classic sequencers.
and in the effects section is still place enough for midi effects,like midi delay and and and

we think with this, it won´t damage the easy-handling of live. launching midi as clips would be the easiest way to combine with live´s engine.
what do you think? some other ideas? please reply
leo/hans