Hold "alt" or "cmd" or "ctrl" on scaling for two or all three axis Proportionality.
This would be cool.
It is possible to drag the middle box of the gizmo to scale for all three axis.
Michael L commented
Thank you Mr. Vitaly Ovchinnikov
it works very good.
or add the same rect function as for moving on 2 axes
yes and it works perfect
juan david pianista commented
Hi, i think woul be cool to have, like with move option, a way to work only wth two axes in Scale option.