I think that updating LED Pattern Editor to correctly handle 3 engines may be required before it happens. While one can do patterns via text file editing, it's a PITA to do anything more than something blue, red, or green.

Personally, I've created patterns (2-engine ones) with different colors for all kind of notifications - at the same time time maintaining style of vanilla "general-purpose" notification, and keeping net intensity the same. It's quite minimalistic on surface (I don't like turning my devices into bloody Christmas tree, blinking with all colors of the rainbow), but required some work and tuning under the hood (especially the net intensity thing).

I would love to (ab)use 3th engine for even more diversity between colors for different events, but "mixing" three colors via pure text, without help of LPE graphs, is a no-go.

Cheers,
/Estel