Great application.. my only offer is to add option to terminate the flow between computer using some key combination like ctrl+f to disable the FLOW..
for example, I want to lock the mouse on specific computer so, I move the mouse to this computer using the flow, when the mouse is there, I press for example ctrl+f to disable the FLow so the mouse is locked on the computer and don't switches by accident to other computer if the mouse moved to the edge.. and when I finish to work on this one computer I enable FLOW with the same combination ctrl+f to be able move between computer again.. The existing option of holding CTRL and move to the edge of the screen in order to switch to other computer is lees comfortable.. more comfortable to switch with out holding ctrl key and when I want to lock it in specific computer by clicking the combination, I believe there is more people that will find my offer more comfortable by enable and disable the FLOW using 2 key combination.. CTRL+F or CTRL+{some other key}