Have a look at
http://wiki.xbmc.org/index.php?title=Action_IDs. The actions you want are:
subtitledelay Show subtitle delay slider
subtitledelayminus Decrease subtitle delay
subtitledelayplus Increase subtitle delay
audiodelay Show audio delay slider
audiodelayminus Decrease AV sync delay
audiodelayplus Increase AV sync delay
You need to edit your keyboard.xml to add the key mappings. The easy way to do this is to install my MCERemote addon from
http://xbmcmce.sourceforge.net/ as it has an option to create and edit a template keyboard.xml. If you prefer to create the file manually press Windows-R and in the Run dialog type:
notepad %appdata%\xbmc\userdata\keymaps\keyboard.xml
If you're prompted to create a new file answer "Yes".
You need to choose what keys to map. Suppose you want to use ctrl-left and ctrl-right to adjust the subtitle delay and ctrl-shift-left and ctrl-shift-right for the audio delay. You need the keyboard.xml to look something like:
Code:
<keymap>
<global>
<keyboard>
<left mod="ctrl">subtitledelayminus</left>
<right mod="ctrl">subtitledelayplus</right>
<left mod="ctrl,shift">audiodelayminus</left>
<right mod="ctrl,shift">audiodelayplus</right>
</keyboard>
</global>
</keymap>
I've just tested this keyboard.xml on my system so I'm confident it works :-)
JR