Touring - Redundant/secondary braking and shifting systems

I've got a Cyclocross bike that I intend to do some serious touring on. It has a fork designed for road caliper, canti (currently equipped), and disc brakes. I have an extra 700c wheelset with machined sidewalls and disc hubs. My rear stay spacing is 132.5mm. I have some spare hydraulic brakes.

The cyclocross bike has Tiagra levers, but I dislike them for touring. I have a spare set of bar-end levers that I love for touring.

I'm considering installing the bar-ends (and just pulling the cable from the STIs, but leaving the levers intact) and at very least the front or rear hydraulics, 1) as redundant systems, and 2) becuase I like them each more for touring. I'd love to hear opinions on why I should or should not do this. Thanks :)

Edit: rear spacing.

Are you talking about having two brakes up front? I like that idea tandems sometimes have extra braking, normally a drag brake. It's easy to rig two brakes up front, so that has greatest appeal to me. I would use a mechanical disc since it is simpler than hysraulic, but then again with a redundant sytem that probablt doesn't mater.

Redundant braking systems are unneccesary, you can usually get to where you need to on one brake.
I carry a spare downtube shifter in case my 8spd Campy ergo-levers let me down, not because they brake but because I have to replace the rear mech with A.N.Other type, non-compatable.

Personally, I like the idea. If you already have most of the parts why not try and see if you like it. I've never heard of someone not making it somewhere because they had too much brake.

Chris

The disc would be handy, especially if you plan on a lot of mountains. On big descents I usually stop quite a bit to let my rims cool down, it would be really nice to alternate brakes instead.

-I believe discs can overheat/warp, so I wouldn't use them solely without care.

-I'd also go with mechanical discs as peterpan wrote above.

discs will probably overheat a lot less often than rims will however