Someone made a mod that allows players to immediately enter crawling mode upon the push of a button. Looks pretty simple too. Could we also see that added to Aqua Acrobatics?

Seeing this get implemented would be nice!
There's a fork of Ido that seems to do something similar,
hopefully this could help with implementing such a feature into Aqua Acrobatics.

This feature is added in 1.10.0, but is disabled by default since it's not a vanilla feature, and requires the server to also be updated.