Wrrr I like #tmux very much but … lack of mechanizm to get information about currently used client and their settings (like SSH_CLIENT or pty used by client) annoying me. Especially when I attach from different type of terminals which have additional control codes to use (f. ex. #iTerm setting color of tab or #ShellFish setting color of the bar).
Another feature which could help is passing the response of original client terminal to control character ^E (\005 ENQ). the last is not supported by all (should be), but transparent access be tmux would be nice.