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No? Well now you can anyway.
Some anticheats may detect and ban you if change your own scale, this shouldn't apply for size changes of other players.
In the future the mod will have an option to disable the Camera Height change that is responsible for bans
Since Version 1.3.1 its now possible to disable this feature
/scale <height in meters e.g. 1.75> [player name]
Enables or Disables the EyeHeight change Feature
/changeEyeHeight <true|false>

Lets you adjust the size of players in meters