Great to hear it's being worked on again!
I'll try to run through all the things I'd like to see in future versions of Kymaera...:
1) Sounds to me that you got the right take on how to implant the list/sublist into Kymaera. Minor idea: please add some space between the sublist link and the whole gamelist so it's easier to spot each one right away.
2. More gamescreens! If you select, say, Pac-Man, it would be great if it was possible to cycle through extra infoscreens about that game; one for boxart, movieclip, instructions etc. That would help to include more details, without having to have it all on the screen at once, which would be impossible on a small screenresolution. I know it's already in someway possible to do that in Kymaera, but I think it's only two screens, with the third being the screensaver (correct me if I'm wrong). What I would like, is a way to be able to add as many extra screen as I'd like to.
3. Right now it's only possible to display the "filmstrip" screenshots in a horizontal way, could you please make an option to have it vertical too? I think vertical direction would make it look/work better, because it could then have the same direction as the gamelist.
4. More precise skinning application, please. It would be nice to place the graphics by typing in x/y pixel values, like: screenshot h: 230, v: 150 etc.
5. Great to hear about the scroll speed for the gamelist has improved. It would also be nice if it was running more smoothly as well. Would that be possible?
6) You talked in a previous post about support for moving images (as seen in AtomicFE). This is something that would be cool if you were able to use a small graphic tile, repeat it into a pattern and then move it in one of eight directions (up, down, left, right, up left, up right, down right, down right) as seen in many arcade games background title/select screens.
Okay, that's all I can think of right now...

Glad to hear you're back!