According to the Advanced Class Guide, the Slashing Grace feat gives the following benefit:
Choose one kind of one-handed slashing weapon (such as the longsword). *When wielding your chosen weapon one-handed, you can treat it as a one-handed piercing melee weapon for all feats and class abilities that require such a weapon (such as a swashbuckler's or a duelist's precise strike) *and you can add your Dexterity modifier instead of your Strength modifier to that weapon's damage. The weapon must be one appropriate for your size.
Would it be possible for the feat to be implemented such that the chosen slashing weapon be treated as a piercing weapon?
Consolidated Formula Parser Improvement Requests
Per discussion with , this will be possible when the Formula Parser is fully implemented. Tom did not wish to discuss the academic specifics, but assured me this was well within reason. Due to it's near duplication and being encompassed by DATA-2483, this issue will be closed and referenced inside of that.