Yea with VTF crosshairs a lot is possible today but it's not that big of a task for them to port over some of the cs:go settings. There already is a gap function for the open cross (with or without dot) but it doesn't work properly. Not sure why they decided not to implement it but afaik nothing about the source engine is holding them back
Also currently resolution has a big influence on crosshairs so using a low res like 800x600 or 640x480 makes some crosshairs a mess so using a low cl_crosshair_scale often doesn't work out well with low resolutions. This is an issue HUD elements (HUD crosshairs) don't have
Also on the subject of crosshairs they should really polish the VTF files. If you've ever looked at the standard VTF crosshairs to edit them you might've seen that a lot of them are asymetrical (default scattergun crosshair, default rocket launcher crosshair) or off center (default sniper crosshair). Also they probably didn't save the VTFs with the right flags because some are very blurry (top of default medigun crosshair) which is never an issue when I make a VTF crosshair with the correct flags checked. Or they used a bad jpg to make their crosshairs
Commands for resizing or recoloring default HUD damage numbers would be cool. Due to how HUD fonts work that's probably harder to make work though