Thought I was having the same problem running OpenElec. I used the XBMC controller to program my remote and I had to press "Down" for each movie. I switched to the full keyborad and programmed the down arrow and now it scrolls with a single press. I'm not sure what they are mapping in the XBMC controller menu, but using the full keyboard worked for me.
[XBMC] How to quickly skip to a letter in a movies title
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Thought I was having the same problem running OpenElec. I used the XBMC controller to program my remote and I had to press "Down" for each movie. I switched to the full keyborad and programmed the down arrow and now it scrolls with a single press. I'm not sure what they are mapping in the XBMC controller menu, but using the full keyboard worked for me.