1. Au contraire there is already a thread entitled "Running Your Stagea In Rwd Mode, How to?" in the DIY section of the stickies at the top of this page.
2. But it is not very clear unless you read the whole thread where you will learn that for the S1 and S2 Stagea you have to (a) pull the fuse and (b) remove the front driveshaft.
So yes follow Chris' directions for removing the driveshaft
AND pull the 4wd fuse out of the fusebox next to the battery (after which the 4wd light should come up on the dash to indicate a fault).