The Specter of Torment-Styled Wallclimb and Walljump patch, by Erik, merged with a request by idol during remoderation by Maarfy (so yell at him if something breaks, not Erik).
This patch grants the user two styles of wallclimb/walljump mechanics, controlled with one easy-to-change define. If set to emulate Specter Knight-style wallclimbing, the player is able to attach to and automatically climb up a wall for a configurable amount of time. If time runs out, the player falls off, and if the player presses B, he can kick off the wall.
If set to normal wallclimbing, the player may attach to the wall indefinitely, and is able to climb up and down at will. Pressing B will kick off of the wall, and pressing B while holding Down will allow the player to simply drop off.
Read the patch itself for a list of known bugs, the most serious of which (arguably) being very poor chemistry with solid sprites. UberASM version is available here, though note it still requires a helper patch.
Also note that this patch overwrites part of the free-roaming debug routine.