Make caps lock "hyper" key?

[FroZen_X]

It seems like that there is a bug in press and hold modifier action. When I set the modifiers in a macro
and let this run constantly I can press any key and the modifiers are released, even tho I don't stop
the macro. Is that something wanted or a bug?

As I quote your post:

@peternlewis

You can use the Pause Until action with the Modifiers condition at the start of your macro to pause the macro until you release the modifiers associated with the hot key trigger so that they do not interfere with the behaviour of the applications you are controlling.

Here the help: action:Type Modifiers [Keyboard Maestro Wiki]

Take a look here: