Went through setting up ShapeShifter last night, so I don't need to deal with MuMove4k or MuFastZero anymore? I knew mmu.library was already included.
These are two different things. First, ShapeShifter does require the first 16K free, for MacOs globals. This is what you required "MuMove4K" or "PrepareEmul" for. This is no longer required as the Os keeps the first 16K now free, so no additional steps required for ShapeShifter. MuFastZero is optional, and was always optional, i.e. you did not need to run it in the past. This did not change in 3.1.4.
However, since MacOs stores its globals in the first 16K, and because the first 16K are ChipMem, it is still of advantage to run MuFastZero. I.e. it is a "nice to have" but not a "must have".
Also, and quite independent of ShapeShifter, for some hardware configurations without autoconfiguring fast RAM, ExecBase ends up in chip mem, which slows down the system. In such setups, it is still of advantage to run MuMove4K and MuFastZero to also map ExecBase to fast ram.