Hi
If this is a Xine related issue, I think the Xine forum/list/whatever might be of more help. Once that is figured out, you should be able to find information about how to set options for Xine in this forum (pretty sure I've seen such posts).
Not sure if upgrading Xine is easy, depends on how LMCE controls it. The key here is the Xine_player, and some searches should provide information about it, and if it requires a patched Xine.
br, sambuca