Thanks. Nothing that helps me directly but there are couple of interesting things to try in those threads. Also, it does confirm that I'm not totally off asking those questions. Perhaps if there are a few more interested people, a bit more attention will be paid by developers.
Soon I'll see if 22" monitor might help K-M to show more tabs
I think running two K-M with different profiles might help performance, when many tabs are open, but that remains to be checked.