Yeah they are, but the way you've done them, the numbers look subscript. Btw, You know you can actually create tempo markings that play back correctly as opposed to just text boxes?
In the expressions pop up box, go click on Tempo Markings on the list on the left. Then click the create tempo marking button that has appeared somewhere on the tight side. Then it's pretty self explanatory.
Insert Note, lets you insert a note, the Tempo tab at the top lets you control playback (just tick the one that says to match the text or something like that).
Hopefully you can actually do that in PrintMusic 2010 because you could in the 2009 version.
As for rhythm grouping, I'll explain some other time (hopefully later today). I just woke up and I gotta go out in like half an hour. I think I made some sort of mega post on this somewhere in dahans' topic. But put basically, there are a bunch of rules when it comes to the way you write down certain rhythms/note values.