The IRB has the official law modifications for 7s and 10s on it's website. For the 10s modifications, Law 21.3 (a) (on penalty and free kicks) is amended to read "Any player may take a penalty or free kick awarded for an infringement with any kind of kick: punt, drop kick but not a place kick." So in a word, no. Edit: @Sports: that quote is for 15s rules, not 10s.
I'm not positive about 10s but I play 15s and we have used the tee on the penelty
Penalty (rugby) ... It is also sometimes used as shorthand for penalty goal. ... referee's decision, or using abusive language or conduct towards any match official. ... If a kick is taken, the side that the penalty was awarded against must retreat 10 metres ... The kick at goal is usually taken off the ground from a sand or plastic tee . They can also use the penalty to kick for territory or tap the ball and continue running it. .... Main article: Rugby union match officials ... The ball is generally placed in a kicking tee when taking conversions or penalty shots at goal
