I am slowly working on it. I fixed
-the open rom dialogs -- hildon style and most extensions are now visible by default
-the blight input plugin config dialog -- ok and cancel buttons are now visible without extra trickery
-pulled r20 gles2n64, made all gles2n64 resolutions settings work again with sdl_gles
-fix gles2n64 x86 builds (for scratchbox) -- but the plugin crashes either way with the sdk GLES2 simulation libraries.
-fixed close window -> quit
-and created initial packaging.

You'll find the packages in my depot, but I'm not linking directly to them because they will do nothing for most people, and they have the default config files. Also, they're not optified: ensure enough rootfs space (~3MiB) or it'll break your N900.

I am installing mupen64plus with gtk+2 GUI to /usr/bin, plugins to /usr/lib/mupen64plus/ (so this HAS to be set in config files, UNLESS you delete them from your ~ and let the application recreate them).