yeah they can, just use them like normal levers, the old acor levers i think look best for not a lot of $$$ http://www.ebay.co.uk/itm/Acor-Auxiliary-Brake-Lever-Set-for-Cycle-Cross-TT-Single-Speed-Bike-Cycle-/380773980006?pt=UK_sportsleisure_cycling_bikeparts_SR&var=&hash=item58a7e5d766
@Dogtemple started
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yeah they can, just use them like normal levers, the old acor levers i think look best for not a lot of $$$ http://www.ebay.co.uk/itm/Acor-Auxiliary-Brake-Lever-Set-for-Cycle-Cross-TT-Single-Speed-Bike-Cycle-/380773980006?pt=UK_sportsleisure_cycling_bikeparts_SR&var=&hash=item58a7e5d766