Hello, I'm writing this just to inform everyone on updates, and where you can get support for the engine.
Recently, the developer of RGM locked it's forum, because understandably he was too busy to keep check of it. So, this can't be used for asking questions or resolving problems. You can still check it though, your problem may already be resolved. There's also pretty much no contact details for him, so you can't ask him directly.
I made a website/forum (EDIT: I no longer look there, so it's dead) ; at first it's use was going to be for posting RGM games, but it also has an alternate support forum you can use and I'll try to help anyone I can. By the way, you can also post your own RGM games (and also 'news' posts at this website).
Smallcombe made a tutorial for modding his RGM game Rage Frenzy. I will be changing this tutorial to suit RGM in general, and adding stuff to help anyone new to RGM (it's quite an easy engine anyway, but tutorials would help). Smallcombe's tutorial is already very useful as it is, and I'd recommend it if you're new to RGM.
LATER VERSIONS OF RGM
The developer of RGM has said he'll keep updating RGM, new versions will still be posted on his website. I'll be posting them here too. I don't know what will be happening with the Jage3D engine however.
Cork279 (I didn't make RGM, I'm just trying to help ;P )