You shouldn't have any issue doing that with HotKeyNet either. There should be no auto-launch in any of the default scripts I've seen, they all require either manual launch {you launch the games yourself} or a hotkey to launch. If you only want 1-= sent, just delete everything else from the key list
Code:
//-----------------------------------------------------------
// DEFINE HOTKEYS FOR ALL KEY COMBINATIONS THAT WILL GET
// SENT TO BOTH WOWS. ADD MORE KEY COMBO'S IF YOU WANT.
//-----------------------------------------------------------
<Hotkey ScrollLockOn 0-9, Plus, Minus>
<SendLabel w1, w2>
<Key %Trigger%>
To turn off broadcasting either use the "Turn On" checkbox toggle in the HKN interface, next to "Pressed Keys" or under the Actions menu, or you can insert a pause key in the code. Or you can close HKN altogether and relaunch it when you need to, though I have to say that the resources used by the broadcasting programs I've used over the years are usually much smaller than the resources used by an open and unused game window, so if resources matter that much you're better off closing the additional games.
Code:
//---------------------
// TOGGLE HKN MUTE
//---------------------------
<hotkey Pause>
<sendpc local>
<ToggleHotkeys>
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