Incase anybody is searching for a simple and elegant way to make a desktop shortcut for Vendetta installed in a custom path, here's one solution.

Create a script file, startup.sh for example, inside Vendetta folder and add these following commands:

cd [path to folder]
./vendetta

Then create a shortcut to that script and place it on desktop.

This removes the problem on some linux distributions where the executable is not finding its datafiles when launched from a normal desktop shortcut.

if you installed it correctly, there should be a file called vendetta in your ~/bin directory, which links to ~/.vendetta/update.rlb (the actual executable you should run, since it checks for updates before launching the client). That means you can run the command 'vendetta' as long as ~/bin is in your $PATH (which it should be). A launcher on the desktop that runs this command will work.