Hi Smedley, - I’m in the same boat, Jigsaw + Sierra, with the same issue, want to use Sierra’s TT routing…
But simply “giving up”, rolling over and putting them down as “not so modern” doesn’t accomplish anything constructive, either. Tradovate’s commission (free) model is amazing and worth supporting!
What we should do instead is keep pressing the issue (persistence beats resistance!) with requests and upvotes until they do what they need to and can take our money because I’m sure they wouldn’t mind. 