Hi there, long time no see
MTP means Media Transfer Protocol. It's the main way that most newer Android phones interface via USB with a computer, allowing your computer to browse certain folders on the phone, and transfer media files like photos, music, and videos...
and this kinda suck big time
since we all want to fiddle with the rest of the memory too... right
but have a look here if you haven't seen this already: http://www.mysolutions.it/mounting-your-mtp-androids-sd-card-on-ubuntu/
I haven't checked it thought... I just found it so don't blame me if it won't suit you
The only good thing about the new way to handle this with the SD Card is that it can use all the memory to install program on(not just the internal) but that means that you can only access it as MTP as it's always in use.
I got "some" problems with mounting this in winblows as 'USB Storage' but haven't seen anything if this in Linux...yet
Oh... but I use Fedora mostly if that would make any difference which I doubt.