Description of feature
The idea goes as follows
If your grabbed by a beam, and hold a direction on wasd into a solid block, your character will "grab" onto it, its a general instinct to do this usually
Grabbing on freezes your movement and causes you to float there, held on, maybe with a custom animation of you ina swimming animation with your legs facing the WS, could be useful for multiplayer, add some cinematic moments of teammates saving others, or just make a tenser situation
As it currently stands, you can only get caught behind other blocks to stop the pull, which feels kinda lame but i feel this would be a neet addition, maybe could have mechanics of its own, if you take damage you lose grip, etc
Sorry if i clog up suggestions, i just wanna separate them from one another and they sorta just keep coming up in my head as i go, game development n all that

Okay, another idea instead of that, maybe you can fishing rod entities out of the beam? lol

While this seems pretty cool not sure how it would fit into the mod, and the feasibility code-wise

here's a mod that allows you to wall hang [https://www.curseforge.com/minecraft/mc-mods/wall-jump]

With how the pulling system works at the moment I don't think the fishing rod idea would work very well. If a mod does what you want however I don't see a need to implement it myself.