One of my favorite mseg’s is the LFO on Melda’s Msoundfactory.
To me, it kind of combines the coolest parts of lots different modulators in a unique way.
It has basic waves, an mseg, and It even includes a performer/stepper modulator like I requested here: Stepper/Performer modulator
It lets you combine and morph between these types of modulators, all within the LFO. It also lets you automate morphing between the basic waves, mseg, and performer/stepper.
If we had a modulator like this built into Bitwig, that would be cool.
The features this modulator has would be super useful for audio rate with the mseg as suggested by @x.iso. You can, for example, create custom waveshapers in the mseg, and basically use the mseg amount knob like a waveshaper amount knob.
Msoundfactory had audio rate in mind with this modulator, because they have the same design for the main oscillator in Msoundfactory.