A longstanding bug affecting multimonitor configurarions (issue 28) where the primary screen is not the leftmost one has finally been solved.
This, combined with the optional pressure sensitivity, should allow to use the extension both with intellihide and autohide in all multimonitor configurations.
A new version including this fix targeting GNOME Shell 3.12 is going to be released soon. In the meantime you can try the master branch on Github. This feature is going to be backported to GNOME Shell 3.10 too.