You can go make a feature request on github though.  https://github.com/prusa3d/PrusaSlicer/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc , add another to the almost 1700 open issues lol.  Please please please check if someone has already made the request first though before adding a new one if you do decide to do that.

Given that the 2 bits of software now use completely different code languages for a lot of it and also different libraries I doubt its as simple as merging come code or doing a pull request though.

You could also try Configuration>Preferences>Gui and select Settings in non modal window.  That allows settings windows to be separated so you can still have the 3dobject/preview window there while changing all the settings.

How can I add  other items there, like "sequencial printing" , which I am toggling often.