You should be able to jump to the location of a saddled pet, which causes you to attempt to mount it. If you fail the mount check, you fall off to a random adjacent square and may take extra damage on top of the normal amount for failing to mount a steed.

Blessed jumping boots allow you to jump in the same radius as the Basic level spell, instead of Unskilled.

Eating the corpse or tin of a jumping spider should (have a chance of?) conferring temporary intrinsic jumping on the player.

When you attempt to jump to an unlit space while carrying the Candelabrum, it automatically comes alight (rapidly consuming the candles as usual) to light the destination space.

The maximum distance you can jump decreases the more encumbered you are.

Getpos prompts (when you can move the cursor around for things like jumping or centering a stinking cloud) highlight the path from you to your cursor if that’s a meaningful thing for its use. Meaningful uses include jumping (highlight a straight-line path from you to the destination) or _ travel (highlight the path that you would travel along).

Highlighting could possibly be done by changing the glyph shown, but would probably be better off inverting the foreground and background colors.

Jumping either acts on a timeout and can’t be done right after a previous jump, or else it takes a full turn’s worth of movement points (more so than the existing mechanic of reducing movement points to 0).

You can jump over swimming monsters in water, and over tiny monsters.