Lets clear up a few things, and perhaps suggest some things that make more sense than some of the off-the-cuff and empathy-lacking rubbish that has been suggested here
1. I would not expect anyone to be bringing on a kicking tee unless the Captain, the kicker or the referee have signalled an intention to kick at goal.
2 However, if the coach (or someone) does bring on the kicking tee on without any of #1 happening, then its pretty obvious why... he wants the kick at goal, only, its not his decision.
3. In #2 above, if the Captain/Kicker spend too much time deciding, and in the meantime, the coach/player bringing on the kicking tee arrives at the mark, then the decision has been made for them, its a kick at goal.
4. Even if the opposition notice that the kicking tee is being brought on, they should NOT take that to mean a kick at goal unless they have seen that the referee has signalled as such... situational awareness is the responsibility of the players.