I'll put TacOps and StratOps on the list of things to get, with Campaign Ops for later. The SPAs are pretty easy, the tooltips explain those well. Skills like small arms seem obvious but I don't know if they have a point in the game. I always set my Mechwarriors to auto flee, and as of yet not tried to field infantry or aerospace.
I just love the setting and everything about Battletech. My uncle had TRO's laying around when I was a kid. I grew up with it, just never really had a chance to actually play it. I love running a force and campaign and MekHQ and MegaMek are really excellent for that. I just tend to be somewhat of a rules nazi in that I want to know why things happen the way they do, so I want to have the rules where I can look them up.
The programs work well because I would be happy dedicating 12 hours on a Saturday to play and I can't imagine there are many people wanting to work that into a group ;D