Hi Ella, I took a look at this setting for the side pane today.

I've got it set up for the next beta with a new entry on the Options dialog to put the Side pane to the left or the right:




I also looked into trying to pick up on the OS setting like you were describing, but unfortunately there were some complications with that.

From what I could find here, that setting is kind of mixed in with another windows setting for menu alignment, rather than it being stored as distinct setting. That looks like it will cause some problems because that same menu alignment setting is also present on non Tablet PC windows and it looks like it would be pretty easy for me to get the wrong setting on non Tablet PC machines, where the standard menu alignment actually corresponds to the left-handed setting on TabletPC... So rather than risk getting the wrong information I just made it a simple Left/Right choice.

- Michael