Undo events during recording

Whilst recording musicians I often fill my time editing parts on the arrange window, trimming etc. Way back, I think in SX3 and possibly 4, if I made a mistake in my edits I could hit the undo command and it would undo my edit without affecting the recording that is being taken … Since Cubase 5 the undo command is ignored during recording and any errors force me to wait until the take is over. Any chance you could put that feature back in??? … it has saved me hours of time over the years and keeps me happily occupied whilst Mr guitarist/singer etc gets a good take down. Mac version I’m talking about here, dunno if it is the same on PC?