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1: Not that I know of. You can use the Shared keyword to allow the procedure to access the same list as the main program. Newtypes can be passed as a pointer, but I don't think lists can be assigned to pointers so I don't think passing a list is possible. Maybe someone else knows a way though?
2: No, only indexed arrays can be declared within a function. As before however, you can use a global list with the Shared keyword, so long as you remember to clear it each time and don't do any recursion.
3: Hmmm, looks like a bug. What version of Blitz are you using? I vaguely remember in the AmiBlitz changenotes that there was a fix for some bug in parameter passing that you may have stumbled upon. It looks like a mismatch of types that's not getting picked up by the compiler / debugger. I would suggest always declaring types for parameters like that, and that should avoid the problem:
Statement test{c.b, r.b, w.b, h.b}
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