Tracey. Previous scripts have had you to deep scan something to trigger a communications option in the comms panel. Clicking on that could engage the tac-warp which then shuts off a few seconds later. Then you have to recharge the deep scanners to get the comms button to appear again... That way once it is charged... its waiting for you. And you cant use it at will... which would have obvious play issues.
Work it baby!
EDIT: Could also set it so that there are two comms buttons. One works when targeting an enemy ship within 'x' kilometers and the other for your ship. You could choose which to tac-warp.
Question, when 'tac warp' is turned off, what is your set speed?