Make tasks involving paid services flash a notification by default

Add a option on payed services (sms, calls, etc) to flash a notification when used and have it enabled by default (option to deselect).

This would be a safety net to avoid "rogue" tasks from racking up additional charges without the user being aware.

My particular case was having a task continue to run due to issue https://tasker.helprace.com/i498-stop-doesn-t-work-when-making-recursive-task without me being aware since there's no visual feedback outside of tasker that it was still running, all while racking up insane communication charges (in the thousands).

I just want to avoid anyone else to have to go through the same situation.