Blacklist some commands to prevent data loss

I'm +1 on this. There's no case where doing something dangerous like that from Slingshot makes any sense.

How do we make a concise list of commands to forbid in Slingshot without losing it's convenient "run dialog" functionality?

I really like having the ability to run terminal commands without the hassle of opening a terminal, but I agree that users should be warned / stopped when they do something dangerous.

Unfortunately, the number of dangerous things one can do with a command line is somewhat infinite...

As an outsider: I don't think there's a point of this, since even if you let's say disable rm here, the troll could then just say that it should be written in a terminal, where it isn't disabled. I don't someone gullible enough to copy a random text from the Internet to a searchbox and click "run command" without understanding what that command does, would not do it in a terminal too.

rm is blocked in the actual synapse command plugin