It's nice to know your player is willing to work with you and not against you.
Oh, for sure. This is my regular play group, and they frequently give suggestions on things that are usually far worse than what I might've done. Like, one time they were rolling to pick a lock, and failed. The player whose character is the one actually doing it said, "Oh, great. And now I bet there are guard coming to deal with us."
Well, there sure is now.
This is potentially a reason you couldn't use "take 20" when trying to pick that lock. A thought there is the guard shows up 20-(how much you failed by) rounds later to tie them together a bit.