Add MDL Quads Spank and More Accurate Cymbal Sizzle

1) With the MDL Drumline extension, I've noticed there's no option for a spank on the tenor drums. For those unfamiliar with a spank, it's a shot followed immediately by a palm mute of the opposite hand. Every time I want to write one, I have to create a note in the margins and edit the dynamics of the shot.

2) I've also noticed with the cymbals, there's a sizzle, but it's echo continues after it should; a sizzle is an abrupt stop to a crash. With sizzles, it's also nice to know when to bring the cymbals in, so some kind of notation for when to bring them in would be nice.