I tried this on my MP 1.18f test system, using a true MCE remote control (not my Ortek/Hama remote). I am pleased to report that upper case letters do jump to the first entry in the list that begins with that letter in upper or lower case. You can actually type additional letters too, to jump nearer to the item that you want.I will look in to it again, and definitely try the shortcuts in "Videos".
To get this behaviour, I used "MP Config" and in the "Remotes" section I selected "Enable HID", and used the default "Classic" profile.
-- from CyberSimian in the UK