Add a "average" or "most calculated" str:dex ratio option

[solakram]

the current str:dex ratio varies by a huge margin only by adding or subtracting 1 level of the character. while the calculations might be correct, it is very hard to determine a optimal str:dex ratio for your class.

i guess this is more a question of is this tool made for min maxing for very specific (levels + equipment) scenarios or to determine whats the optimal build for specific classes in general.