Hello there. Two things I found quite obstructive when looking through valve maps:
1. The actually visible part of the map is blocked by invisible stuff, mostly "player clip" etc. Is it possible to hide all that stuff at once from your view?
2. Models fading out: It's quite annoying when models are only visible at a very short distance. I know it makes sense, but if you want to see how some changes will look from a further distance without loading the map every time, it gets really in your way ... can this be switched off (for selected objects) ?