Tango, what unlikely_spider said is correct. The unchecked "Prozessoranzahl" box will boot all cores. Uncheck the box, restart, and see for yourself in the task manager's CPU performance tab (should look pretty much the same under Win10):
Taking control of an MG Technical shows 250 rounds/50 belt.
In a simple test mission, Kobuleti X, 3 technicals, not grouped, each depleted the 250 rounds. Not saying this will help you fix your setup, but something is different in your setup/MIZ.
They only have 250 rounds with 50 rounds per belt, so, yes, they deplete ammo fairly quickly. Not really ideal, but if you put them within the resupply circle/range of a supply vehicle like e.g. a Ural-375, they will replenish their ammo.
Expect people to articulate their impressions and findings after every patch, because it is "early access".
I also feel like I have to relearn some aspects of how she handles now. However, since they already stated "work has started on" tuning SCAS, I assume there's going to be more iterations of readjusting to the FM.
You've added the action as a "Triggered Action", i.e. you need to trigger them. In your case I guess you want the action to fire ad hoc: add the action as a "Advanced Waypoint Action".
By your logic the wishlist forum in general is a bad idea. And to answer your question: it would accomplish adding a new voice option for those in the "we"-universe who like it.