hmm… I’ve found answer by myself here: Different color depending on notification level
I just wonder… I don’t know I would expect such functionallity as fundamental for search&analysis tools.
Well, I have free version so I don’t like to complain… I am very curious what leads the developers (or whomever) to decision not to support custom colorizing.
Two more questions 
Is that valid also for the enterprise version?
Ain’t there any workaround like using alternative web-interface? I know about some experiments on the browser level but that is not the likable solution at all.