Hi Bert,
Careful with the wording here: Quality Profile used is the same, what you’re enquiring about is Quality Gate. There’s no immediate plan to enable full-blown custom Quality Gates on Pull Requests, we rather believe in making sure that no bug/vulnerability/code_smells slips through the cracks, allowing the dev to assess any issue (with the ability to only acknowledge if really needed) before merging.
Note that coverage support for PR is in the pipes:
https://community.sonarsource.com/t/pull-request-branches-to-include-code-coverage/318