+1 for all of those.
I have sent requests for these mod destinations as well:
Global Seq Ratcheting Offset
Global Seq Duration Offset
Global Seq Velocity Offset
The Ratcheting Offset would be ridiculously cool, if assigning a slider or mod wheel to it. Then, while the sequencer is playing you could have real time control over rapid-fire note repeats / note scattering. You could do Aphex Twin style sequence mangling and perform really cool build ups / breakdowns combining the ratcheting offset with other modulation changes (adjusting decay, effects levels, etc) This is my #1 request
Having ability to modulate the offset of Seq velocity and duration steps would also be useful to allow real-time performance control over how the sequences are articulated... if assigned to a mod wheel / slider / pedal... or assigning an LFO could allow for some really interesting effects, changing up the sequence groove/feel.
All three of the above mod destinations would just be
added to whatever is currently set for a given sequence step that is playing... that's why I'm referring to them as "global offsets".