But sometimes, when you houserule (or interpret) it your way you will make life harder for classes or concepts that already have it hard. What then? Leave it and be annoyed by it or change it, but shaft some players character?
To the point:
Did you have such a tricky situation? What was it?
Would you change it or leave it?
Do you know of any rules that could lead to such tricky situation?
One example: Dragonwrought kobolds. (although it's more about balance and cheese)