Well, my biggest problem with coaching is that they have continued to allow this team to launch 3 after 3 at innopportune times, when they could take the ball to the hoop. I think Doc needs to be able to curb that a bit.
As for the things you state, I don't put on shooting. Rondo's FT form has been reworked this offseason by Mark Price. When that happens, it takes a long time for the new form to really start working for you. At this point, all the coaches can do is wait that out, and hope Price knew what he was doing.
As for the offensive foul, I think they have gone over that over and over again with Perk. The problem is, he does the exact same thing every big man does, but since he has gained a reputation of fouling on those picks from earlier in his career, he gets called on it much more than other guys (like KG, who moves on EVERY pick).