[Imp]

Does anybody actually use this, if its simple would a more severe Tank Light be more useful?

Picklist normally produces a good "general" mix of units.
Tank heavy on has minimal effect (read GG long ago) but just increases chance at end of buy to purchase tanks from memory.
End result perhaps an extra platoon not 3:1 tank infantry ratio.

I would prefer the button to produce a infantry biased force.
Say 50% of the time it buys tanks selects infantry or possibly AT units.

I think there have been more tank light conflicts than tank heavy ones, applies to WWII also.
If this is easy would more people use it than tank heavy.