imho the best controler was the GC (had a horrible dpad too though).
anyways, NO to a numpad... just play your strat games on PC. All the 360 controler needs is a new D pad indeed, the rest is fine.
minor changes I would do are:
perhaps make L-R1 a little bigger (as in the finger catch them more easily)
add 2 buttons to have 3 in a row.
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