Security :: Sudo To Disallow Certain Commands?

trying to devise a new sudoers configuration while building a new SOE and would like to force everyone (including system administrators) to use rootsh in favour of doing things like sudo -s, sudo bash, sudo tcsh and so forth. Effectively, use sudo to use any shell other than rootsh. Is there a way to allow users to run anything they want except shells. I realise this is a default permit which inherently is defective, but I'm not convinced that going through the 1559 executable commands of my (as yet incomplete) built system to decided on the likely 1000+ commands I would want to be genuinely allowed. As I said this is for system administrators first, and I'd like to forcibly instil the habit of sudo <command> or using rootsh to get an audited shell. But I know people are already not doing enough sudo <command> as it stands, rather they switch to bash.