you cannot use mouse with vesamenu.
what you can do is to display the menu on a serial line terminal emulator (if COM1 available), then an unattended install should do the rest.
for a neat integration of WDS and PXE and also a WDS alternative see Serva,
http://vercot.com/~serva/an/WindowsPXE1.html
http://vercot.com/~serva/an/WindowsPXE2.html
here you have explained the serial line control of vesamenu
http://vercot.com/~serva/an/MenuPXE4.html