Editing Polygons Post-UV Unwrapping

[Tracekill]

Well I feel like a fool! I've just finished my model of the TDI Kriss Super-V and just started my UV unwrapping in preparation for skinning. Keep in mind, I'm still but an amateur although not a complete newbie at this. However, I am human and, as such, made a big mistake and realized it all too late.

In the course of unwrapping my model I found that I had forgotten to connect two vertices, leaving an extremely awkward polygon which is obstructing my unwrapping process. (Image here) If I attempt to switch back to Edit Polygon mode from the Modifier List, it gives me a warning and then, after I have completed the manipulations and try to return to the UV Unwrap modifier, the UVs are completely destroyed! Is there no way I can just simply connect this edge without ruining the UVs? This would be incredibly demoralizing to do all this work only to have to re-do it for some simple mistake.