Thanks for your message! I'll answer it point by point:
#1: I've often toyed with the idea of having the sample start be changeable via modulation. The reason it's not in the sampler right now is that in "disk streaming" mode, only the very beginning of the samplers are cached in memory. Being able to modulate the start time would require a large portion of the sample to be in memory. The solution would be to have a preset mode where content authors can flag certain groups or certain samples as needing to be loaded into memory (the way Kontakt does with its Sampler vs DFD distinction).
I'd be curious to hear how you're actually using this modulation?
#2: Yes! I've just added it to the feature backlog
#3: I agree with this, although I have to wait until I'm done with the basic sample editor and LFOs before I tackle this.
Yes, I'm familiar with Fred Poirier's work (he's a legend!!) Decent Sampler now has basic EXS importing support. Just go to the Developer Tools menu and find the Import EXS or SFZ File... option.
– Dave