This is the best version of the jetpack plugin for lf4d, which works perfectly without errors of purple and black squares, in texture.
The only thing missing in this version is an option to enable only for admins.
I would appreciate it if someone with more experience can include this command.
It is possible to include in this version 1.1.0 of the plugin: Version: Generate .cfg:
Sm_jetpack_adminonly = CreateConVar ("sm_jetpack_adminonly", "0", "only allows admins to have jetpacks when set to 1", FCVAR_PLUGIN);
This plugin works by using a bind key: Bind "alt" "+ sm_jetpack" // Press & Hold to use.