Limit repaires on a building until after 5 minutes have passed since the last damage
No building in a small vacintiy if the base is recently attacked(several times raids have boiled down to bomb until the run out of resources to spam new walls)
I could see stuff being built to help repel invaders, but not fortnight rewalling what just fell
Doors being the only exception to the repaire during combat rules as bracing doorways was a tactic used alot
EDIT: increase range of archers also would be great
Repair hammer could repair few hp per hit.
Or maybe add some repairing animation that last few seconds per tick.
But i firmly disagree with increasing archer range.
Idk if your talking about archery as a whole or thrall archer menace range.
If you are talking about archey, i disagree becoz currently the arrows travels kilometers before losing strenght. Lol.
You can fire an arrow more than 1 quadrant away 
A ram would be awesome too.
Imagine. You and your clanmates ramming the enemies door while they try to shoot arrows at you.
I was refering to the thralls, as it is now players will just snipe archer thralls before moving in but yeah range on bows is great under the old archery system i used to be able to hit someone that was almost a little dot on my screen, i dont really use bows since they changed it