To comment out a block in Rodeo the docs state to do ctrl + /. But on my machine thats not working, so I want to change a single keysetting. Where I am able to do this in Rodeo?
You can edit key-bindings in preferences http://rodeo.yhat.com/docs/#preferences
Changing the key bindings should avoid the use of ctrl + /, but if you just want to change a single setting, as far as I know, it's not possible. It's hardwired in https://github.com/yhat/rodeo/tree/master/src/browser/ace . You can write some code and build your own IDE if necessary.