The "submit your own clash" feature is very nice!
I have spotted what might be either a bug or a missing cheap useful feature: when you "test in IDE" your problem, your solution could be in the IDE, instead of the usual boilerplate.
Also, it would be nice to have a way to go back and forth between the statement and the IDE (but I didn't look too hard for such a button, maybe it's there already).
It also wish we could edit/cancel our submissions after sending. E.g. I suggested a puzzle but realized later that it was probably not for the correct category, I'd rather not waste the reviewers' time figuring that out too.
As for statement translation, there are quite a number of french people on this site who would be able to submit a bilingual statement. That's again potentially saved time for your reviewers, but I can understand that you'd prefer to keep full control over that part.
But please don't let this list of suggestions change the tone of my post: very great feature overall!
I especially like the ability to mark the suggested puzzle as unsuitable for some of the challenges!