The video below should be useful material for any gamers out there trying to convince their GMs that, yea, indeed, their character with the peg-leg can do that ridiculously acrobatic thing after all:
Remember: your PC does have that high a level in his or her dexterity/coordination/agility stat, and he or she does have his or her dancing/acrobatics/tumbling skill maxed out. Or he or she should, at least, if you’re trying to justify tap dancing with a peg-leg to a GM. The point is that your PC really is a beautiful and unique snowflake; that’s part of the point in playing a roleplaying game in the first place*.
*For the non gamer geeks: this assertion is not… universally held.