ROQs are not used for rendered cinematics - they are only for fully prerendered cinematic video, such as the opening credits of the SP game and a few shots of flying through Bespin, as I remember.
If you want in-game cinematics, though, you need to use BehavEd to script them in the ICARUS2 scripting language.
Both the ROQ compiler and BEHAVED are in the JK2 tools... can't remember if they're in package 1 or 2, though.
You can get both on my Radiant tutorial website
under the "Tools You Need."