All of my templates are based on my “not saved but automatically stored” color preferences.
These color preferences include color scheme per track type (midi, audio, groups, fxs, etc). I find back my color choices when I create new projects from any of my templates.
Though I do not color my tracks per instrument type (i.e. drums = blue, strings = purple, etc).
El Capitan / N10.2 (all 64bit) is very stable on my system. I did experience some e-licenser issues last year on N10 release but not anymore with following e-licenser versions.