I'm getting ready to upgrade from an older Allez to a new Roubaix in the next few weeks. I greatly prefer a flat bar to a drop for my road riding, and have been enjoying the conversion I did to the 105 components to enable this on my Allez. On the Roubaix, I have the option of going with a cheaper version that has cable actuated disc brakes, or going to a more expensive version with hydro which I would prefer (I'm mainly a mtn biker and prefer the feel of a properly bled hydro brake). I know I can use my current Allez flat bar brake levers with the cable set up, but is it possible to mate a mtn bike XT shifter with a road bike caliper?

Does Shimano sell a road bike specific flat bar brake lever for hydraulic brakes?