Rounded is standard now, with squared being a 'no cost, no additional option charged' option if requested. Now, to stir pot, the reverse holds true with end caps; the standard end cap being squared (if there's a standard end cap ordered, or already in place), with a rounded, thin, or rounded/thin being an 'no cost, no additional option charged' option if requested. There are a few others too; all black or red spacers, saw teeth / no saw teeth on Model #18's, and a few I'm probably missing. Personally, I like the metal spacer upgrade for an additional $20, but you won't find that in the catalog either.
Interestingly enough, in the catalog, under the Model #22 listing, it simply says (something like)
other handle options are available; some of the nicest RMK's I've owned were tricked out Model #22's. This one only had three options (metal spacers, stag handle, NS end plate), because the SS blade and NS hilt are standard. Not sure about the thumb notches, I'd have to check. But I had another with nicer stag, finger grooves, NS end plate, a lined lanyard hole, a waxed no-hone sheath, and a squared NS hilt; it had thumb notches too. The squared hilt and waxed sheath didn't count towards the current five option limit.
