Currently it doesn't. I have little faith that it will ever be updated again.
I've been using Samurize more often because it does that and a lot more (for instance embedded radar images). It seems to be fairly stable. It does things like autohide and allows you to pin it to the desktop. One drawback is it's a bit less USER friendly than Sysmetrix as far as taking someone else's skin and appying it to your machine.
I've tried Rainmeter and I find it a bit unstable and much harder to skin.
I've attached an example of a Samurize skin I made. Notice there are no graphics involved. I made it to go with any skin I happen to be using. You could probably put one together fairly easily.