This enquiring mind wants to know-- how much free space after a full install? In keeping with the thread's topic, maybe you could post a screenshot of the Status panel?
1. Nope, only with music files.
2. Yeah now it works good.
3. ColorPearl works but it turns all color leds on, so you have only all on or all off selection.
4. I haven't tried to install it yet, but the version I have installed in 4.2.1 works under 4.5 after upgrading.
I'm guessing instead of turning on R or G or B, it turns on all 3 lights at once ... so you get a mesh of colors that looks differently depending on how you look at the trackball.