You can already do this within PQR itself. In the settings, you have an option called "Manual Cast Function", it even comes with a description. Set the function name of your choosing, then create a macro in-game with the following:
Code:
/script if YourFunctionName then YourFunctionName(1) end
IE. If you call the function Hamburger, the above macro should become:
Code:
/script if Hamburger then Hamburger(1) end
You can't have spaces in the name, no symbols, periods, commas, etc. Only Alpha-numeric characters. Then all you do is activating "Manual Mode" that ships with PQR. Default keybinding for Manual Mode is set to Shift+Control+Alt+G.
Hope this helps you in any way.