Broadcast mouse on hold button down

Hi.

Would like to ask when someone has the time to explain to me how this is done.
What i want to do is hold SHIFT down and then all the windows get the mouse broadcasted in all the windows.
Release SHIFT and the broadcaster is not broadcasted on all the windows, just on the active one.

Have messed around with this on the mapped keys but its not getting me anywhere.
If you have the time to answer Thank you!
(Star Trek Online)

[lax]

Don't use Shift as your Hotkey.

Otherwise, in the Wizards menu select Mapped Key Wizard. Pick a Key Map to put it in -- probably either "Always On" or "Non-combat" depending on whether you want to be able to turn off this Hotkey or not. Then pick the "Broadcasting Toggler" type of Mapped Key to create. On the last page, name your toggle, configure the Hotkey, who you want to broadcast to, and set it to Toggle when the Hotkey is "pressed OR released". This will turn it on when you press, and off when you release the Hotkey. Finish the wizard and Export to Inner Space.

[Skarling]

I use CapsLock for this.