As the title says, if you select multiple units and move them somewhere, they should preserve whatever formation they are in by default, it shouldn't be necessary to lock formations in or use alt+movement for this effect because...has anyone ever selected a formation and then desired for them to dissolve that formation to all line up side by side at their destination? I for sure never have.
Would remove a good deal of rather unnecessary micro from the game.
Also, it should be that units marching in formation should all move at the same speed. Right now unless you lock formations, units ordered to move forward with alt+movement will get drawb apart because faster units will rush ahead and slower units lag behind. This is stupid.