DaveWooster
'95 ST1100ALS and '98 Standard ST1100W
In winter, the type of gloves that best accommodate this type of grip seem to be called shooting gloves, or shooting mittens.I always have both of my index fingers holding a grip, so that I can steer quickly and control the throttle well, regardless of what I am doing with the hand levers [using my middle, ring and little fingers].
Here is a photo of some of those mittens in textile. (They are also available in leather.)