[Feature request] Nested shortcuts (surpress macro when further modifier keys are pressed)

[Buggfix42]

Title says it all. I personally have a little issue with input-remapper.
I defined "Shift+Backspace" to be the "Delete" key, since no application ever dares to define "Shift+Backspace" as something. The problem is that I also use the key combination "Ctrl+Shift+Backspace" in my notepad program to delete from cursor to line end.
So naturally, pressing "Ctrl+Shift+Backspace" will execute the macro and become "Ctrl+Delete", since input-remapper will ignore what additional keys are pressed. It will just look if specific keys of a macro are hold, surpress the keys and execute the macro.

So I'd like to request adding a "No additional modifier keys" option when defining a macro.
This option should surpress activating macros when more modifier keys than requested are pressed.
So if I define "W" to be "Control+W" and check this option, I can define "Control+W" to be "W" without both macros interfering with each other (this example is useful in gaming for me).