I think another good set of features (not to be a greedy hog, but oink oink), would be copy and paste function and/or having the Fill tool, under "To (subbeat)", fill to the end of the song when you put in a -1 or a number higher than the total subbeat count. I just put in 999999 to see if that were already a thing, and I broke it! :D
Keep up the good work! Looking forward to the new features.