Has anyone ran into the problem of manually editing chapters with this unit ? My friend has the 1500 model and can place his chapter markers where he wants them opposed to the unit placing them every 5/10/15 minutes. I while I can find the menu to take chapters out I have yet to see where I can place chapter markers where I want them. While recording Tv and music videos marks are auto placed in really bad spots like in the middle of a show or video and I would rather place them at the end or when a commercial comes on. I have the ZU model of the 1600. Would it make a difference that he is useing a DVD/RW disc durning this process?