Harder bosses

[Lord Striker]

Just do a bunch of level-scaling based on the number of tier 4s in a server - more pikemen = faster bots, more archers = sturdier bots, more commandos = more damaging bots

It would indeed be better to make the waves harder or easier according to the players present in the server (if it's possible code-wise). If you just make the waves a lot harder, new players (yes, here I come again with the new players argument ;D) would'nt have such a great time.