Actually, reading through some FAQ's I realized I made a mistake when I upgraded to Lion and Sib 7 the same week, and that's why I was getting the bugs. I believe I just fixed them. Among them were the 18" Sus Cym sounding like a castanet, but like I said, I saw something I was doing wrong. User error!
The only thing that consistently bothers me is what I just posted in the "suggestions" forum, which as far as I know is more of a Sibelius issue than a "template" issue, so I don't even know if you CAN fix it. (Showing key signature when switching to a pitched instrument on the staff of what was previous a non-pitched percussion instrument). I also wish there was a way to playback ripple rolls. That's pretty much it for me. If I come across any other "bugs" though, I'll be sure to keep you posted!