I am currently using Synergy with broadcasting. I found a solution that works well with mouse looking. If anyone has any suggestions please let me know.
This is what I did:
For the server, check the relative mouse checkbox under the options.
In the hot keys section, I added the following two hotkeys:
hotkey 1:
key: right mouse click ( mousebutton(3) )
function: Lock Cursor to screen: On
Toggle radio button "Hot key is pressed"
hotkey 2:
key: right mouse click ( mousebutton(3) )
function: Lock Cursor to screen: Off
Toggle radio button "Hot key is released"
In effect, when your mouse is on your secondary screen and you proceed to right click to move around, it will lock the mouse to that screen so you can move around. When you release the mouse like you would do when you stop looking around, it unlocks the mouse from that screen so you can go back to your other screens.
It works perfectly for me, except the fact that when you release the lock on the screen the cursor resets to the center. If anyone has a solution to that please let me know.
For now, it seems to be working great. I now have the ability to toggle keyboard broadcasting and mouse looking on each secondary screen.
UPDATE:
The cursor resetting after releasing the right mouse button is way more bearable if the secondary monitors are set to full screen mode and not windowed mode.
-goose
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