Is possible to disable context menu?

I think it is impossible.

What is impossible?

Generally I found the way to disable context menu. All you need is to create the empty context menu template (c:\program files\truelaunchbar\contextmenu). Make XML file with text:

Code:

<?xml version="1.0" encoding="utf-8" ?>
<tlbmenu name="Empty menu" />

And select this template in the TLB Settings->Context menu. This will disable the menu.