FOSS gamedev and creative worlds

I want to know is there any way of increase the tolerance of ant_cheat.
It resets the player's position often. (A bad internet worsened). I do not want to reset the position all the time but also do not want to be able to teleport to any location on the map when i want (this is no exaggeration)

Yes. Add a setting for this tolerance or simply disable anti cheat.
The anti cheat system is bad and, yet, none is going to make it better.

You could override minetest.node_dig that if the player is given and he/she has a tool which can't be used for digging the node digging is aborted.