Hey,
I would add on these three, one thing that I've suggested in the past:
Based on third suggestion, and always based on some admins argument that 'they want to play and not be babysitting', simplify the spawnkill rules:
In situations where spawn is a flag, but it's mostly permanent for a team, don't treat it as capturable because most of the time it's owned by a team (example: et_beach allied spawn on flag).
CP spawns, treat it as capturable or not, but the same for all maps, don't have different rules for each
If you really want to simplify, make sk a standard (example: 1000 radius for small spawn areas, 5000 for bigger spawn areas, this is just random numbers, but could be done)
In maps where one team can have advantage of mortar placing it near spawn exits or inaccesible areas for enemies, disable mortar for both teams or punish the mortar with advantage. Example of this was pirates map, fortunately they are disabled now, another example i've just seen is in supply depot, axis mortar between the 2 axis spawnexits, if you want to get him by mortar you have high chances of getting kicked for sk