Rune Tap currently has the same rune cost as Blood Boil, and Crimson Scourge currently gives a free BB or DnD/Defile. What do you guys think of CS making RT free if you have a charge available? I know it would be nice if you had that extra chance to use a CD if your runes were on cooldown.
It would give that proc a little more dynamic than just an extra bit of damage, plus if I recall correctly, RT is off the GCD and you'd be able to use the proc without it interfering with your rotation.