Gonna start by saying I agree that the hard line between perma and non perma Dom is not ideal and overall I'm not opposed to looking at it. But I also don't think it's a big deal. I'm not a fan of this particular suggestion, really because the con you mentioned would have a pretty decent sized impact on me. Not a game breaker or anything, but I wouldn't like it. I did read through the thread, but if this suggestion has been changed I missed it.
Giving Doms a better ATO proc/ability would be fucking awesome in my opinion and I love this idea. Obviously the details would matter, but this is the kind of suggestion I can get behind.
You can definitely influence the Scrapper crits with their ATOs, but not as much as Stalker crits and optimizing does require some numbers work that people may or may not want to deal with. Though I get you still may not be a fan of that, which I get.