You need to set some values in ~/.kde/share/config/kickerrc (I don't know if there are any global kickerrc files).
For example, by default with the kmenu on the left, in the [General] section with the Applets2 item KMenuButton_1 is listed first, but when it's on the right it's listed last (they're listed in their order on the kicker from left to right).
You also want to add a section [KMenuButton_1] which consists of the following:
This tells the kicker to give 100% free space possible to the left of the kmenu, ie. shove it fully to the right.