There isn't a way to get the old stylepicker back, but there is a way to change the two features that you mentioned that you don't like.

Changing the tempo is a setting in the options... Press the options button.

Showing a lot of styles can be solved by deselecting "show similar styles" checkbox.. Note that the styles are sorted from best to worst, so showing a lot isn't a bad thing, because you can just ignore the ones that are more styles than you want to see.

Have Fun!
Peter Gannon
PG Music Inc.