Adding/Creating instrument templates

Hi everyone!

First of all, I would really like to thank everyone in MuseScore's development team, I've been a Finale user for a long time but since the 2.0 betas it became my main tool for creating and arranging music (along with my notebook hehe). Thanks!

Now, to the point:
Even if it's not really a problem to select manually the instruments I want to use every time I create a score, I would like to know if there is any way I can create and modify custom instrument templates so if I'm arranging like 10 songs or so with the same instrumentation (i.e. trumpet, alto sax and trombone, which I use a lot) I can just select that template from the template selection screen and save that little but valuable time.

Thanks in advance, greetings!