Found this last night, and it's turned out to be pretty fun and applicable. If you don't want to watch the video, the basic idea is that if you are climbing a low ledge and press A, you will perform a low wall attack, but the direction of the attack behaves differently to if you were simply doing it against the wall.
The places I've managed to get it to work on are:
The cereal bowl in Giant's Table
Some of the steps on Bell Tower
The back of Trophy Room
The tables on Medieval Chef
I'm sure there are more uses to this than I've shown, so please share anything cool you find.
I found this way back when I experimenting with ledge hop wall attacks with Robin Hood. I use it a lot when I play Captain Hook but it's pretty bad with Luna (no damage/hitstun on wall dash anyway) and Robin Hood (does less damage and followups than a normal wall dash, really only good for pressure). You can also cancel the ledgehop animation with airdash or shield dropping for faster platform movement (airdashing away also lets you airdash at a higher height than a normal full hop without burning your double jump) grab while ledge hopping to pressure platforms, or cancel with aerials which produces some weird interactions for certain characters.