There are reports that drivers can mistake a pair of motorcycle headlights as a car being further away (so be aware of that). I think there may have been an EU directive for manufacturers to only use one when dipped. However Speed and Street Triples of certain years are twin dipped as standard, personally I haven’t had a problem (so far).
I’m sure I’ve read posts some years ago on the other forum where people have done the mod (might have been on SprintST’s), think a different/extra relay was involved.