I have soup deleting turned off right now (by turned off I mean "not written" ). It will be in the next release though. Keep in mind that deleting from a soup = deleting from the entire Empeg. if you were to just delete the ref from the soup it would just recreate it the next time you sync.

I haven't really thought about that kind of soup... Let me give it some thought... Currently you can layer tags and searches, so you can do "By Artist / By Decade / By Album" or "All Marked Tunes / By Artist", but it looks like you're talking about a new soup type that is like a modified of By Tag that would be By Tag <split on first letter> or something like that .... Probably won't make this release, but I'll think on it some...

Mike