There are definitely ways to change the FPS.
Of note, I see that during render there is an option to render From a specific FPS to yet another FPS. Nice.
Places you can change the FPS include the players (Combo Viewer, Viewer) and Render and Preview settings.
If you think about it the Xsheet is technically any framerate you desire because a frame is a frame is a frame so I doubt you'll see any place to change framerates there.
Generally animation is 24 frames per second... video 30 FPS. But it gets complicated.
Your selection of 12 is good because if you adjust the xsheet to expose that on 2s..... 12x2=24 frames per second. :)
Sounds like you are off to a good start.