You need to be in 'emulation' mode for those options to be available. Start playing a ROM and then press 'Tab' key; the options will now be available. When you think about it, it makes sense; game properties and cheats are specific to a game, so you can't edit them unless you're actually playing a game
You don't need a stella.pro file for newer versions of Stella; all the required info is built into the application. The stella.pro file is used to override the built-in ROM properties. Basically, only developers will ever really have a need for it. And Stella will generate it automatically when required. Essentially, you don't have to worry about it. Just make sure Stella can find your ROMs (by navigating to your ROMs folder within Stella, or setting the default ROM folder in 'Config Files'), and just click 'Play' to start a game.
Hehehe.. I feel like a total idiot now. Thanks so much for your time! It works perfectly.
I figured you could look at rariety stats when you weren't actually playing a particular rom, but I guess that is not how it works. Is this something to easily implement in the future, or would it be too much of a pain? Thanks again.