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You can apply a rule of thumb, rather than a USR to what a twin-linked weapon should look like.

you can make basic assumptions from other aspects of the weapon profile:

lots of shots - anti infantry
few shots - anti tank



So you then build twin linked weapon profiles:

twin heavy bolters - normal profile +x shots (not just double)

twin lascannon - normal profile +x strength/damage


You thus have a distinction between two of the same weapon mounted and an integrated twinlinked weapon.