I've executed RACcheck 2.1.6, and found some... annoyance that it's possible to avoid: when you use option '1' to manually enter root passwords for each node, the script goes on and begin to check.
Then, at some point, it asks for the root password. If you aren't looking at the terminal screen at that moment, there's a high chance of a timeout raise, and the root part of the scripts is not executed (it happens the same for the second node).
Shouldn't be better to ask for the root passwords just after choosing option '1'? That way, you don't have to be looking at the screen, afraid of the root password timeout ;)
PD: I don't know if this is the correct way of suggesting something like this. If there's any Oracle admin around, please move this to the appropiate forum or tell me if there's some email address for feature suggestions.