Before Rocket launcher there was only Hyperspin which had a modules folder for .ahk scripts to go.
Then Rocket launcher came along with its own ahk scripts and if you have a Rocket launcher folder in your Hyperspin folder then RL scripts will be used. The default should be for Rocket launcher to be you default launcher this is set in the settings.ini file in your HS folder but shouldn't need to worry about that.
Most of your Rocket launcher setup should be done in RocketLauncherUI if you're a novice. Under the 'Modules' tab for MAME is where you will find those MAME ini settings. Hopefully you've managed to do it via the ini as suggested by jesfknkrys.
My HS2 runs alongside HS1 on my cab and I test new builds when they are available.
If you want to test it aswell then great but if you are looking for something that works now then a beta is not for you.
Welcome to the world's most beloved mascot, good to see you taking a break from opening other people's packages and wacking off Goombas.
Have fun, it's great to have you here.
P.S. Keep to the speed limit and no blue shells.
If it's not then that will definitely be added at some point. Currently the Devs are working on the theme builder which is looking amazing and so are the themes produced by the artists.