When using Mods like Minecraft Comes Alive which could change the players' model height, the first person viewpoint will still be default.
That caused a problem that when player is too much tall or short, the field of view will be covered by tools, models, or no hands, tools rendered untill the player looks down.
Specially when using mod weapons, tools which are conspicuous and garish, the problem will happen more seriously.

Changing the camera position is not something planned for this mod.

Got it, thanks for your reply.