Just to clarify, that is correct. Once CorePC approves the 1.3 version (if he ever does /smile.gif' class='bbc_emoticon' alt=':)' />), I'll create an Oblivion-only version for players who do not have Shivering Isles. The idea, then, would be that only one file would be needed regardless of your setup.
The currently posted version of MOBS 1.3 needs one small tweak: it includes two new weapons which Bethesda probably meant to add but forgot to do so. These weapons prevent MOBS from being added to a "Stats Only" bashed patch, though, so they will be removed from the final version.