Can Altium do via stitch patterns when interactive routing a group?
Well, I spent a solid hour or so trying to find the answer, gave up and asked here. Then a few minutes later I had the idea of seeing what shortcuts are available during routing (Ctrl-F1) and then finding that the 5 key will go through via patterns, one of which is the pattern I was looking for.

So, pressing 5 while routing multiple net's will give you other via patterns.