-When browsing through someones posts I'd like it if there was a sorting feature so that I could select a specific board and see all the posts the user has made on that board.
You can go to
IgnoreBoards, check all the boards you
don't want to see posts in, and click 'change profile' at the bottom, then visit the person's post history. Those boards will be entirely unavailable to you until you unignore the boards you selected.
I use my account LoyceBot in a different browser for convenience for counting campaign posts. If you have different campaigns with different requirements, you could just make a few more accounts so you don't have to adjust the list of ignored boards per campaign every week. A private browsing window and
can help.