I'll chip in my 2 copper and suggest you set up enable/disable VFX repeaters/sources mapped keks with VFX Action steps that are tied to for example your "ActiveKeyMapsToggle," so they'll just automagically set themselves up when you press the key. As opposed to doing it via the in-game GUI. Makes it easier to tweak things later and modify it for different situations.

If the ISBoxer wiki link doesn't get you up and running or my comment doesn't make sense eventually, post back here and I'll give you some more examples.