I use crosshairs on aliens and they do make enough of a difference that it is worth making the change. I also use lots of binds so that I don't have to stand still when evolving, building or using the armory. I think the advantage of binds is far greater than the advantage of the crosshairs. Even so, the question of 'Where do you draw the line?' is pretty simple.
The answer is cfg files.
cfg files are meant to be edited. So my binds are all perfectly legal, but the crosshairs are less clear cut, because while they are done with custom cfg files, you have to point your hud away from the default file which is "txt", not "cfg" and from there you create new .menu files which define the HUD. There is no "messing with PAK files" involved, other than being aware of what is in them.
When I asked Timbo "Crosshairs, legal or no?" his response was "probably not, but meh... it's open source"
There is a fine line too between personalising your game and holding an unfair advantage. I am not looking for an unfair advantage, here are my HUD files, use them if you want:
http://www.evilbastard.org/slight/chompers-ui.zipunzip to base and type "/cg_hudfiles ui/chompers.cfg" from console to activate.
/cg_hudfiles ui/menu.txt to deactivate
You must start a map for the changes to kick in.
Here's a list of changes in my HUD. These customisations are closer to fixes than exploits IMHO:
* Player names are smaller.
* Timer is larger and more prominently positioned.
* Small crosshair on all aliens except granger.
* Adv. Dragoon barbs are positioned vertically beneath the crosshairs to be more prominent. This may also assist in judging height vs. distance if you get used to it.
* Darker background on human HUD so you can clearly see credits and build points remaining when holding the construction kit.
Don't use this HUD if/when you play on SATGNU tho.
