A two step is pretty easy.

Create a mapped key.
Give it a hotkey.
Give it two steps.
Have it send the first keybind on step 1.
Have it send the second keybind on step 2.

If you want to make it a toggle.
So you can have your normal one step DPS key and have the two step version of the same.
Then you make them both, and they have the same hotkey to activate.
On one of them, check the box (in advanced) to not load one of them at start up.

Then create a toggle mapped key on a different keybind.
This has two steps.
On one step it enables one of the mapped keys and disables the other.
On the other step it does the reverse.
Keymap Actions > New Mapped Key State Action
And possibly have a Pop Up Text Action, to notify you of which state you're in.