| Ali,
The master cylinder does not have to pump more fluid so there is no increase in lever travel. The system will have marginally more fluid in it with twin lines but that's it, no other effect.
As far as bleeding goes, just do it in the time honoured fashion. Pump up, hold lever in, crack the bleed nipple, retighten, then release lever and repeat until there's no air comming through. A bit awkward single handed but by no means impossible. Easier and a lot less messy if you use a piece of tube from the bleed nipple to a suitable receptacle. You should avoid any spillage that way. Just remember to keep topping up the reservoir as you go! Another little tip would be if your master cylinder doesn't have a bleed nipple on it, replace the stock banjo bolt with one which incorporates a bleed nipple. You'd be amazed at how much air can get trapped at the top end of the system.
Hope that helps,
Neil | 
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