MixRecall + AuxTracks + PatchPoints + Project Templates all work together nicely. I really really like it as it helps a lot with large band recordings.  Been using these features for hours and hours in recent days and did not encounter a single issue. Love it.
 
I did discover some yet unknown features like the possibility to recall a mix only for a selection of tracks and buses. Somehow missed that until now, but this brings great flexibility
 
I also wasn't sure whether mix templates from MixRecall would be carried over into a project template and from there into the next project, but it seems to be doing it just fine ...

You have touch on some killer features in Sonar. I particularly love Mixrecall. I posted about it a while back when I found I could compare BFD 3 settings using it. To me it was a revelation that I could have a single output v multiple outputs and compare the two. Keep in mind this required changing the internal routing within BFD 3. Mixrecall had no trouble recalling those changes.
 
Here you have added more to the collective memory of the forum. Thanks.