the clutch is there for a reason. its not just for starting and stopping it also helps take some of the stress out of the rest of the drivetrain during shifting. in a synchromesh transmission the whole point of the syncros is to eliminate the need to manually match the engine speed to the road speed to allow the gear selection to take place. therefore, all you do when you dont use the clutch is put the added stress of the engines output on the synchros and transfer that stress to the rest of the drivetrain - gears, synchros, dogs, output shaft, bearings, chain, rear hub - as an instantaneous shock . the clutch is the consumable item in the system by design. so, instead of trying to get used to getting the timing right just use the clutch; you're not saving much time anyway. bedsides, you're doing all the time consuming motions of shifting already, just pull the clutch a bit while you're doing them. it just doesnt make sense not to.