You can do that. Taking turmoil scales does unlock some bad events, which dilutes the pool of random events you want to aim for by getting lots of random events, but it's not incredibly terrible in my experience.
You can
try that. It's a theory oft tested on the domkill nations (that aren't r'yleh). I've actually done it quite a lot both in Dom 3 and 4, which is why I've stopped :V
You can still play through it with usually (
usually) not much trouble, but mostly it's just notably likely to be freakishly
annoying. Invasions every other turn, all sorts of irritants popping up in your message log, etc., etc., etc. Particularly with the changes in Dom 4 to PD, I very much don't think it's worth it,
especially for the non-r'yleh domkill nations -- tank everything but order, luck, and magic, basically (and/or growth, for asphodel), otherwise you're going to be spending half your time reconquering provinces in your backline with your freespawn (or just leaving chunks there, which is bad enough) instead of sending them to the front to do something useful. It's playable, but I don't really find it fun to play anymore.
Turmoil two (or maybe one, depending on how bad the T2 unlocked stuff is... I had remembered most of the major problems being T3, but it's definitely possibly I was misremembering) is about as low as I'd recommend, and even then... if you're doing it, you're doing it for gems and magic items,
not gold. Luck 3 and Order 1+ will net you significantly more cash if you're going high luck primarily for that, even with the reduced events and playing a popkill nation. The order positive events can be hella' sexy -- free castles,
gigantic lumps of dosh (iirc the largest single gold event is order locked, somewhere in the range of 3k in one go), that sort of junk.