Key signature guide

[ScoopJohn]

Can be there a feature where you can assign a key signature in a module track so that it will be easier to type in correct notes when making an original music?

[nyanpasu64]

Should key signatures be song-specific, not module-file-specific? If so do I just shove it in the toolbar? Or a menu entry?
They could be assigned to bookmarks too.

How to deal with various forms of minor? (Avoid various modes for time being, or list alongside minor?)

I will probably not implement key sig anytime soon.