Know what Engies need? Moveable Sentries/Dispensers/Teleports.
You can pick them up and move them, but the trade-off is:
General Rules
-Same metal cost to build/upgrade as old buildings
-Same health levels as old buildings, maybe a little less
-Engineer can’t do anything else while carrying building
-Buildings take 2 seconds to place after executing the action? Whack it with your wrench (switches to last weapon automatically after placement, so if you pick up while wrench is out it returns to that) to minimize the placement time to 1 second?
-Drop occurs immediately though, just like placing a building for the first time. You can drop and switch to shotgun to try and chase off weaker classes.
-Can be sapped during placement process and be destroyed almost immediately. This would require a clever spy though.
Sentries
-Sentries can only shoot in a 90 degree cone
.Give them the little range dome when moving/placing so the Engineer has an idea of the area they cover.
-Can’t shoot while being carried
-Looks like a half-sized version of regular level 3 sentry.
Dispensers
-Only contain half the health/ammo, maybe a third of what a regular dispenser contains.
-Maybe only gives out 3/4 of what the old dispenser put out at a time? 3/4 slower health regen at all the same levels, only 30 metal instead of 40?
-Or dispense the same amount at a 10% slower rate?
-Can’t dispense while being moved.
-Lots of variables to play with to keep it balanced.
Teleports
-Take an extra 3-4 seconds to build up a charge?
-Same here, can tag any increase on recharge time to balance.
I think the sentries and dispensers would be most interesting. They’d be most effective for an offensive engineer, who could keep their sentries moving forward and sacrifice some line of sight. It would also give the defense more reason to use their ubers rather than as a straight counter shot. Lots of times on larger maps, the engineer’s defensive line is in a place the defense can’t directly access anyway, or the blue team spawns closer to that area. It’s mostly to prevent spawn campers.
Moving sentries would also be susceptible to spies more. Since they can no longer shoot behind themselves, you can backstab the engineer first and sap the sentry comfortably in its blind spot. Unless another sentry is covering it, a moveable sentry has a big weak spot.
Dispenser moving helps the defense and offense stay alive in larger groups. Every time the battle moves up a corridor, grab the dispenser and move it along with the group. It kind of gives the Engineer the ability to do a Medic’s job, but you can just adjust dispensing levels so a moving Dispenser can never replenish health faster than a Medic can.
Teleporters speak for themselves. Most maps you have two points of conflict and teleporters only bring to the one furthest from your spawn. After that, the lines have moved forward and there is little use for them anymore. Movable teleporters might help on maps like Goldrush though, keeping them right around the corner from the payload so the user never has to travel far.
Moveable gear is obviously appealing to the offensive engineer the most, and I think it’s a step in the right direction. Teleporters are always useful. If a team of twelve has two offensive engineers or a team of eight has one, you will at least know that all the stuff isn’t still back at spawn because the engineers can easily move it to keep up with the front lines. Two engineers can stick together and put their sentries right next to each other to cover their backs, two lines of fire, or whatever they so choose.
I think that’s something engineers should/might get.