@BozzerBigD - I think you may have missed the point of this. It's not about what difference it would make to end users, it's about what it might be like to write code for. When AMD extended the x86 to 64 bit, it wasn't just wider registers, there were more of them, newer instructions, etc.
For MC64K, for example, we merged the integer and address registers into 16 64-bit ones. Similarly we increased the FPU to 16 registers too. We also allowed effective addressing modes to be used for source and destination operands for all dyadic instructions that made sense and likewise made some of the monadic ones dyadic. As we were making a virtual machine to run the code on we were free to experiment in this way without worrying about how difficult it would be to implement in in silicon.