Add 1+ block of space limit to certain parts of avatar limbs:
Legs: Should have 1+ more cube of space upwards, even though this could compromise a bit of the articulation during movement depending on the avatar, this could also allow the modelling of tall knee pads/armor related to knees if done properly for example.
Thighs: Should also have 1+ more cube of space upwards, considering it’s only 3 cubes tall, it’s too small in comparison to the leg which is 5 cubes tall, but making it 4 cubes tall could allow players to make taller avatars in general easier and also the modelling of the glutes and the overall hip articulation work properly in these cases for example.
Arms (from shoulders to elbow): Personally I think it already has a neat limit and it’s possible to do a lot with it, so it should remain unchanged, however the problem remains to the other part of the arms.
Arms (from elbow to hands): Distally speaking, this part already having 8 blocks of length is great, but the problem comes when it’s closer to the elbow, making it +1 block bigger in length in this direction could allow more freedom for the player to adjust the size and where exactly the elbow articulation should happen.
Extra suggestion: Vertical adjustment of the arms option
The game already having horizontal adjustment to arms is a great addition, but to make it perfect it should also have vertical adjustment, considering this will make taller or shorter avatars have the option to have arms that make more sense to their shoulder articulations and anatomy, could have something like 5 different heights (1 for the standard height, 2 upwards and 2 downwards).