FOSS gamedev and creative worlds

So, I was just giving some thought to a couple of mod ideas that might be nice. Is it possible to make something similar to a grappling hook that you can swing aroun on?
Something like Teeworlds:

Or Trine:


I have no experience with Minetest physics/whatnot, so I am just wondering if it is possible. Using the players position it might be possible to make it so once the player grapples onto a node, the position is locked so deltax^2 + deltay^2 + deltaz^2 = length of grappling hook (with the delta's reference being the node at which the hook is centered on)

Just some quick ideas. The math is easy, but I don't know if it is possible to manipulate the character's motions like so.

Possible, but it'll be unusable as a mod. Mods all have the problem of being server-side, and therefore tons of lag.
I play Teeworlds too :)