Interesting discussion going on over in a bike forum I frequent.
Seems Shell has added a multi vehicle T6 that has friction modifiers in it. Bottles are supposed to be marked "multi vehicle" and it you get the old heavy duty it's still ok for bikes and quads.
Also they just started discussing whether JASO MA and the JASO MA2 markings. The 2 meaning it's safe for bikes with catalytic convertors.
There's nothing like a good oil thread that at some point just makes you want to stop using any oil at all.