I keep two Radioshack 1/4" TRS right angle adapters plugged into the 1/4" only ch5/6 inputs. They fit and 'turn the corner', allowing insertion of straight TRS cables from the front of the machine while in the bag- actually they exit at an angle due to the carrying strap attachment lug, but can be angled either up or down, which ever orientation works better.
Those would work in the combo XLR/TRS jacks as well, but I mostly use right angle XLRs into channels 1-4 for a few reasons: I prefer them, one less connection point that could develop problems in comparison to using the Ratshack RAs, XLRs lock, the the Neutrick ones can be re-oriented to the angle desired if necessary by opening the case with a small screw driver without re-wiring, and most of my mic cables terminate in XLRs anyway. I do have a pair of mic cables which I've modified to have 1/4" TRS male plugs on the recorder end which I only use into the RA adapters in 5/6.
