I'd pay to unlock them, unfortunately that not how it works here
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Well, I would also call those options hidden since they all are a part of the current ZeroTier version included with RouterOS which simply lacks the ability to configure them.
LOL. In fairness they do have to map all the options to RouterOS attributes. While low bandwidth mode is trivial. Multipath be much tricker to map to RouterOS — it both changed over time, and need some more advanced interface selection than picking an interface-list. I suspect they's why things are "hidden".
That being said.... Multipath support with ZT on MT has been my hope for a VERY long time. And I think quite useful on a Mikrotik since RouterOS lack good bonding options for asymmetric links. In particular, ZeroTier added a "link quality" option that might have some value with LTE and other wireless:
https://docs.zerotier.com/multipath#link-quality
Anyway +1 from me to "un-hide" the rest of ZT's features.