This is a bit meta, but I don't know if I want to 'complicate' the base AS rules with more optional ways to use heat. I'd MAYBE be open to it as an advanced or optional rule, but I think base AS is in a good place right now. It's fast, has a decent number of tactical options, but doesn't have too many fiddly corner cases to remember. I like the rules light and tight, and have very serious misgivings about following the Total Warfare path of ending up with a rule for everything. Also, heat is one of the ways mechs feel a bit different from each other. Adding more ways for non-OV mechs to use heat might possibly make mechs feel even less different from each other than they can now.
In my opinion, one of TW's problems is that it has too many published rules. Sure a bunch of them are advanced or optional, but they still manage to confuse the heck out of players both new and old! My opinion is that there is a TON of stuff that should have been left to the realm of people's house rules and not codified at all. I really, REALLY don't want to see the game slow down very much, or get any more published optional rules than it has now. The fact that so many people have been able to easily house-rule some stuff to make it more fun for them suggests to me that the core rules are in a pretty good place. They are providing a solid system that people can easily tweak to get it playing the way they prefer without telling them exactly how they should do it.
Lord knows we make our own house rules and adjustments to many of the games we play in my house, but I'd be hard pressed to say ANY of the house rules we use need to be added to the base games. They are really only to make our one little group happy, and not something I could really say that the game as whole needed.