...it depends on what you're referring to here
.
Simply having the climber bash as long as possible? That's a standard delaying tactic, of course it could be made more consistent by making the piece of terrain thicker, but most Lemmings players should know about this, similarly to assigning a floater early or late, depending on whether one wants the fall to be fast or slow.
Bombing through the terrain at the bottom of the pit? Yeah, making it a little bit thinner could help?
The double builder turnaround trick? Honestly, to me that is one of the most obscure tricks ever. I like it a lot myself, but it is hard to teach to new players without explicity informing them about it.
In contrast to the three builder wall from "I have a cunning plan", or the double miner turnaround, both of which could be figured out with extensive logical thinking, I doubt anyone less seasoned would consider the option of a builder "bumping his head" on a staircase that's behind him rather than in front of him.
Especially since the three builder-wall is also a thing, and in that case none of the three lemmings turn around. The double builder turnaround requires one lemming to step over a lemming who is already building, and then start building early enough before the first staircase becomes too high.
For my upcoming pack, I made an introduction level with a pre-level text explicity informing the player that this trick is possible - because I considered everything else to be too unfair.
Meaning: The level boils down to "do you know this trick is possible or not?", and if you don't, then you don't stand the slightest chance of solving it.