This is only designed for indoor use.
Yes, my desk chair rolls easily on it. However, the smell that this mat puts off will require at least 2-3 weeks in an open air (non living space). The headache you will get from the smell will be bad if it is not aired out properly.
No, it appears to be a tough rubber.
Yes, this will work. Please be advised that this mat comes with a very bad smell though.
I don't understand your question but will just comment that this mat is easy to cut with a metal straight edge, sharp razor knife and gloves.