This plugin allows users to enable/disable double jumping.
Features
Edit Jump Speed
Permissions nodes, stop unwanted players from Double Jumping
1.8+ Compatible
Permissions & Commands
/jump - djump.jump (allows access to /jump)
Future Updates
Disable jump for other users (OP)
Suggestions
Leave suggestions in the comments, I'd love to hear everyone's suggestions or even your opinions!

Double Jump 1.0
Double jump with a simple command!