Nope, that's the only thing, really. I converted my Strorm RTR to a Pro and that was the only "gotcha" I found. Everything else was pretty cut and dry. The pro chassis is pretty nice overall.
It was a fun conversion though and it really makes you appreciate the differences. The Storm Pro is actually quite a bit better then the RTR!
Of course, you don't want to stop there. You need to get those Hardcore Racing titanium shock towers =) At least the front one. That's what I got, anyways. I broke two shock towers (one was a so-called "indescructable" aftermarket one) so I finally just got the front one from HR. It's very sweet!