I'm not sure if you have a question. You are correct in that we do not have a run new checks by severity option. If this is a feature you are looking for I suggest putting in a FMR associated with your account.
No, this was not a question. I was just sharing some information with the community.
Regarding opening an FMR, I can do that, but I have been submitting FMR for MVM for a long time, and I never get a feedback other than the e-mail confirming the submitting of the FMR (even with platinum). I don't think I will do it. Seems to me that this is another one of those functions that I find hard to have been skipped by the dev team.
Anyway thanks for the feedback.