So I have! In the end not for me. I’ve not seen anyone do it to a Scandal, though plenty have to O-O steel 29er frames, including myself. Personally I think the long tt and short ht of the On-ones makes them less suitable for drop-bar conversion. You need to get midges close and high for a proper position to ride off-road in the drops – so long steerer tube, lots of spacers and/or steep, short stem.
There is lost on mtbr if you do a search.
I’ve come to the conclusion that drop bars need a specific frame off road (shorter tt, longer ht). A lot like the Salsa Fargo
http://www.salsacycles.com/fargoComp09.html in fact, or the up-coming Singular Gryphon (is that right?).
Lots of info here too:
http://g-tedproductions.blogspot.com/2008/10/drop-bar-for-mountain-biking-part-i.html read on and see links for his series of articles.