About Grain - Suggestions??

[deepndark]

Hey, I have been experimenting with Grain and there's lots of ways to manipulate a source.
Anyway, if you load in a sample that has a tempo, then obviously the root has the original tempo as it is, but when you play lower keys, it will slow down the tempo and the highs play em faster. Which made me want to ask, would it be hard to make a new mode, which would time-stertch the source so the tempo would remain the same, all the time?

Another thing, would it not make sense also, that the loaded sample's "SIZE" would play at least 2 Bars long sample to the very END?

I'd also like Comb Filters to be added.

Thanks!