Hello @Waldek_Herka and welcome to the community!
Thanks for your question. Recently we released new version of SonarLint for VSCode with branch synchronization. Here is the release post. Also we have a plan to add support of PR synchronization in future, but it’s not for the nearest time. It’s significantly more difficult than branches. You can find description of the feature on our wiki page on github. As you can see currently it works rather in auto mode than based on configuration as you suggest. Thank you for your idea. We will take into account this approach also.
Thank you for your interest to the feature.
BTW: If you are interested in IDE plugin development, may be you will find interesting the job section on our website 