This is as much a question as a suggestion. For all I know, this is already a feature I'm unaware of.
Before I started with MFP I used Livestrong.com. The food log had a feature called "quick tools" or something like that (which MFP has also) but within that feature it had an option which made a little click box pop up next to each food item so you could quickly click multiple at a time to move (say to another time slot) or delete. Whenever I have a big meal entered and for whatever reason have to delete the whole thing, I seem to have to delete each item separately. It's a pain.