As the title says, I suggest to bring Siege-Repair Hammers back into the game.
Everytime I am checking our Borderland Garrison or EBG Keep, I am frequently running across our damaged Cannon, Mortar, Arrow Cart or other sieges, and every time I see them, I think "Why the hell Repair Hammers exists in multiple PvE maps (for example right beside Tequatl Turrets), but in the WvW, where it will be a real "Quality of Life" improvement, they actually dont exist?".Some enemies even intentionally abusing this. They just made a "preparing attack" to just damage all Keep sieges until all of them have only milimeter of HP bar left, and then completelly leave our Keep to resupply and then make a main attack. They know that if they will completely destroy our sieges, we will rebuild our sieges back in the meantime when they resupplying their army. They just blatantly abusing the fact that If they left just a single milimeter of HP bar in all our sieges, they know we cannot do anything about it, and when they arrive with the main attack, they decimate all our sieges within seconds. Add on top of it the fact that they abusing another fact - they know we even cannot build new undamaged sieges, because there is a limit of only 5 sieges within a 1000 unit radius, so we cannot build new undamaged sieges in critical defensive locations.
Bring back Repair Hammers, and to avoid abusing them, make them usable only under these conditions:
1) One Repair Hammer will cost 10 WvW supply (and will repair portion of siege HP bar equally to its supply building cost) and use it as a bundle environmental weapon (like First Aid Kits near WvW Sentries) , so one player can only have one Repair Hammer at any time
(to avoid hoarding a massive stacks of them by siege trolls and Keep supply depleter trolls)
2) Repair Hammer can only be usable in non-combat mode
(to avoid abusing them as a way for invincible insta-repaired sieges in fights)
3) Create a reuse-time (for each repairable object) of something like 20 seconds, where anyone (even another players) have to wait for the duration of this timer before another Repair Hammer can be used again on that same object
(to avoid abusing them as a way for invincible insta-repaired offensive Arrow Carts etc)
Those three simple conditions of using Repair Hammers should be enough to avoid any abusing non-intended method of repairing. I definitely do not want invincible sieges, I am suggesting this just because we should have an option to somehow repair damaged sieges, when we have fully stocked Keep, any enemies are kilometers / miles away from it, but at this moment we still dont have any options to repair when we run across a damaged siege. Make Repair Hammers able to repair any sieges and objective walls and gates. Ability to repair golems with them would be a big discussion and probaly "big no" , because IMHO golems are intended by ArenaNet as "gold sink" in WvW game mode.
// discuss, feel free to bring another opinions / suggestions about this