Engineer is a useful class to play on Attack, with teleporters being indispensable for getting heavy-hitters onto the front line, and dispensers being...dispensable for health and ammo on the front line.
The problem is that the server I like to play on has banned the Gunslinger entirely.
I want to play Engineer on this server, but I don't have time to build up a full Sentry and still keep my teleporter and dispenser built up.
How can I support my team as Engineer on attack without resorting to the use of a Gunslinger mini-sentry?