From a glance, *script exec goto end is supposedly *script goto end which could possibly be replaced by *script exit since *script label end is missing.

Also, it seems those bangs do nothing (to flip the value of TrayTicker as you intend):

if TrayTicker equals 0, set TrayTicker to 0.
if TrayTicker equals 1, set TrayTicker to 1.

You mean to flip the 0's and 1's in the gotoif conditions.

Otherwise this looks like an elegant solution, inhaler :)