If Ashley did not change it, you can't set the cycle position of the behavior, so controlling the behavior is tedious and sometimes impossible.
I'd suggest instead of using the behavior to just code the sine movement yourself.
Nevermind, seems like there is now a set cycle position action. So just check for the cycle position and deactivate it, when it reached half or zero again. After your pause you can activate it again and set the cycle position to exactly 0.5 respectively 0. Still probably would be easier to just code it without the behavior.