I’ve been working on a custom OFS build that has full spline support.
Can be tracked on feature/funscript2 branch.
Builds can be checked here: https://github.com/Yoooi0/OFS/actions
To edit tangents/weights you have to select one point and enable View -> Action editor
It allows you to do stuff like this:
https://imgur.com/2J2VdhT
There have also been talks about having full spline moves in OSR/SR firmware. If they get added they should allow for really smooth motion without having to interpolate the script at 333hz.
But it remains to be seen if this is a feasible to use, and what helpers need to be added to OFS for faster scripting.