Hi Martin,
Cool stuff! You're right that with a .mid file that you're looking to share broadly it's probably better to keep the effects fairly simple, and let people who will then use their own sound libraries tweak effects for their particular library. For instance, Garritan libraries make a bit of an unorthodox use of the Mod Wheel. Those same Mod wheel settings that make any Garritan library instrument come alive can make you think of fingernails on a chalkboard or time-warpish sounds with some other libraries or MIDI devices
Keep up the great work!
Sherry