I always use BetterTouchTool gestures to call Keyboard Maestro macros or macro group / palettes.
Since I want to avoid too many shortcuts or other triggers in Keyboard Maestro, I use the integrated AppleScript.
You can see how I create such a workflow in this video. At the end of the video I also show the workflow, with the macros I created to make it easier to create the BetterTouchTool gestures.
This is the macro that contains the template for creating the KM AppleScript for the BTT gesture:
Interesting, I got pretty much the same setup, just without the creation macros. You must have thousands of App specific Gestures that you thought you have to make a macro for this =).
Since I mainly work with macro groups = pallets, this is limited.
For each app (Mail, Safari, Finder, KM etc.) I use a palette that only works in the activated app.
So I use over 50 Apps / Programs with only one and the same BTT gesture (3 Finger Swipe right) on the Magic Trackpad.
It was important for me that I don't have to remember any shortcuts or other triggers.
I also have some Launchbar actions in which I also integrate the KM AppleScript...
I take my hat off to the users who mainly control their KM workflow with shortcuts.
If you've seen my video tutorial on the floating HTML menu @Julian_Steinmann, you also know why I created extra macros to use the AppleScripts macro in BTT.
And I didn't have to assign a shortcut or other trigger in KM