Full Tilt Poker $2 + $0.25 No Limit Hold'em Tournament - t250/t500 Blinds - 3 players -
BB: t4700 9.40 BBs
Hero (BTN): t3860 7.72 BBs
SB: t4940 9.88 BBs
Pre Flop: (t750) Hero is BTN with K 
J
Hero raises to t3500,
Both dudes were pretty tight and waiting, is this OK?
Not only is shoving (or essentially shoving; I'm not sure why you left a few chips behind) KJs ok, but you should be willing to shove much weaker hands there like JTo, 98s, or K7s. You can't shove any two cards (unless your read is that the players are very tight), but your marginal pushes should be semibluffs. Some of the time, you will take the blinds, and if you get called, plan B is to draw out. Hands like suited kings, two broadway cards, and medium-high suited connectors usually have enough equity when called that you can push from the button.
A hand like KJs is often good enough to be pushed from 3 or 4 spots from the button.
