It needs to go back to the way it was in GT4. For endurance races, it's nice not to have to drive the entire race. They don't do it in real life, so why do we have to in GT5? And then we have to sit and watch our bobs do their own 24 hour races? No thanks.
So again I think it should stay, but integrated into A-spec a la GT4. And the stupidity of our bobs needs to be fixed. It would be nice to watch them not wreck at the chicane in Monaco every frickin' time they attempt to pass someone there. At lower levels, okay, it's going to happen occasionally. But a level 35 bob doing it over and over? Ridiculous.
Nearly forgot to mention controlling the bobs, too. I shouldn't have to keep pressing "maintain pace" or whatever it's called. If I hit it once, they should continue at that pace unless they get into traffic or I tell them otherwise.