Jitsi Meet API - features I can't find - did I miss them?

Hi All,
There are a couple of features which would be ‘nice to have’, but I can’t find in the external API; just wondering if I’m missing something, or if they are not there:
1/ ability to kick a participant.
2/ ability to control the conference volume and/or volume of a participant (of ONLY the conference audio, not the general Chrome volume or machine volume, as I have a lot of other audio going on which I want to control independently). I already mute them…

I’m currently using the external API; should I move to using lib-jitsi-meet directly for more direct control? Does this have dis-advantages in terms of performance if the page I’m embedding into is already very busy?