I have a 500 and a 501, but I unfortunately can't answer your question about screens as the 500 is 2500 miles away! Sorry!
As for straps. If you can get the clips, you can attach pretty well any strap you want to it. I bought the leather palm strap for a grip and took the fittings off it (they are the same as used on the camera body).
Handheld, a 501 kit can be wonderful, and that is mostly how I use mine. Of course they're great on a tripod as well. My 80mm is my favourite/most used lens. The distagon 50mm f4 is also a fantastic lens, in my opinion.