Well for one, the mod uses 3 different necessary player datablocks. What that means is, the climbing wouldn't work at all, or the playertype would switch back to Fluidity Player. Additionally, all the functions were made and tested for Fluidity Player specifically. As far as a next version, I essentially quit Blockland upon releasing this add-on.
You should use Space Guy's datablock swap support then, as its designed to hold and keep track of previous datablocks while changing them. You can find a copy of it inside of T+T2 (the one with the LMG). As for claiming that the climbing system would not work at all because it uses multiple datablocks is nonsense, as we can also see with T+T where another slow-movement playertype is used for the LMG and is swapped from any playertype you are using, regardless of type. The amount of playertypes is irrelevant; since you only swap between them when you are performing a very specific set of actions.
But I suppose that would put me in the position to fix this then if you've quit; shame your comments are severely lacking so I cannot determine what functions I need to modify; although I can't imagine it would be too difficult to go through the effort of doing so. Thing is, I'm really lazy; so if anyone else wants to take up this task before me, that'd probably be appreciated.