Easier undo for multiple obj creation?

[cgirerd]

I'm trying to get a bunch of choir chairs to follow a concave line - a sort of trial and error "see how it looks" use of multiple copy with polar coordinates. What is driving me nuts is I do a multiple copy of 20 chairs, it's not quite right, so I Undo, but I have to Undo once for every single chair, meaning 20 undos. The command is a single event, so why should the undo be a multiple event?

Any ideas?

Thanks,
Christina