pause on usb connect

[ou2mame]

is there a way to set a pause time limit on what the phone does before you select which way you would like it to connect? because say that i used my phone as modem (i have the cab that shows internet sharing option on the usb screen), and i want to use mass storage instead, my pc is already halfway through setting up the drivers for internet sharing when i select mass storage. i would just like it to not do anything until i actually select it.