Thanks for creating this. We are using this plugin for Ready Steady Pan, a TF2 semi-competitive league.
With all the recent changes, we needed to allow people to use the Thermal Thruster.
Here is an updated version of the plugin, currently tagged as 0.7.1 to avoid possible conflicts in the future.
Source code can be found in this fork
Featuring a new convar:
melee_jetpack 0/1 - Allow/disallow the usage of the Thermal Thruster
I've also created a PR on your repo if you are interested in merging this into the master.
Thanks! I hope you don't mind this, but we needed it asap, so I modified the plugin without your permission.