Adjust fast zebras blinking delay

[Matthew Kieren]

I searched about this and didn't find anything so I apologize if I missed something. I'd like to be able to adjust the delay of alternating between red and blue in the fast zebras feature. Two seconds is too slow, even one second might still be too slow so it would be nice to be able to adjust it to something like 0.5 seconds.

[a1ex]

At one second you'll get dizzy