Here is a blocker release technique , that doesn't work the same between Superlemmini and Neolemmix , due to differences in basher physics , between the two engines.
Let's say you have a bridge with a blocker assigned on it , in the position that is shown in the first picture that I have attached.
If you assign an incoming lemming as a basher at the correct position , as shown in the second picture that I have attached , it will release the blocker , but instead of bashing the entire lower part of the bridge , it will just remove some pixels of it ( as shown in the third picture ) , so the bridge won't be destroyed , and the other lemmings will be able to use it.
Now , in Neolemmix what I have described here can work , but only if the bridge is "under construction" ( only if the builder has has just placed the first bricks of the bridge ) , when the basher is assigned.
If the bridge is complete , or is close to be completed , there is no way for the basher to release the blocker , without destroying the bridge.