So, after waiting for a few days, I got a reply from KDE's sysadmin team, and I'm in. My first patch is also now in -- thanks much to Martin for comments, review, and assistance.

What does it do, I hear you ask?

Basically, if you use compositing, open systemsettings, and enable (or disable) plugins. Notice that flicker while it changes plugins? That's gone now.

Small, but a very nice usability enhancement.

Now, if only the KCMs weren't so ugly. Hm.