Make Mouse without borders ignore my monitor sometimes.

I have three monitors. 2 of them are connected just to my laptop, and one of them is connected to my work laptop as well as to my personal laptop. How I do it, is I work with my mouse on two monitors, and if I need to use my work computer, I simply move my mouse until it gets to the third monitor, and Mouse without borders make my keyboard follows it, and voila - I'm using my work computer on the other monitor.

Now I got a little greedy, and decided that I wanted to use my laptop with 3 monitors. So when I'm working with my work computer I switch the input to the work computer, and when I'm working with my own, I switch the input to that. So I either have 3 monitors on 2 computers or 2 monitors on 1 computer and 1 monitor on another computer.

I hope this doesn't come across like incoherent rambling. Bear with me. I have a question here.

So the thing is when I'm using 2 different computers, my work computer still thinks I have 3 monitors, so in order to reach my other computer, I need to scroll across a monitor that for all intents and purposes, isn't there. What I want to do is to somehow trick mouse without borders into believing that I am only using a total of three monitors, so when it gets to monitor two it jumps over instead of travelling across the long barren wasteland of empty invisible pixels.

Does this make any sense at all? Can you help me?