Thanks for the feedback you gave to these blueprints I registered. Especially including etckeeper in core.
I just registered another to see if we can have tmux included in the core appliance. I'm posting here in the forums since it took awhile for the other blueprints to be seen and I wanted this new one to be considered before 11.0 release gets finalized. I'm sorry if this is considered a faux pas.
Here's the blueprint.