This suggestion comes from me trying to achieve first person animations using MEG. The first attached video is an example of what I mean.
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The new MEG disguise is cool but it lacks the control needed to make an advanced first person animation system. The easiest way to make this possible (for the devs), without adding a bunch of additional functionality to disguises, is to make the MEG-model connect to MythicMobs-mobs as they now do to players when using the new MEG disguises (included in recent dev-builds). To clarify, my suggestion is: to have the MEG-model connect to the root/core MythicMob entity - just like the MEG-model connects to the player when using a disguise.
In the second attached video I'm basically showing what I mean. When using the disguise feature, the model "sticks" to the player. But if I instead mount a MythicMob-mob with an assigned MEG-model on to the player's head (done using a custom Skript command), the model "lags behind" (doesn't "stick" to the player when moving). Also, the model used is just to demonstrate the difference (imagine the model being first person arms like in the first video attached).
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Why would I want to use MythicMobs for this? Well because it would allow for more control such as, playing/stopping animations at will, hiding the first person arms from players that are not supposed to see it, and potentially using other MythicMob features.
Hopefully this makes sense.