The hold & drag is the normal way.
(I STILL want my left click & drag back )
You can also use '[' & ']' to do it in situ (doesn't work for groups or units in phalanx)

Also I increased the default depth for the A.I. with 6-8 ranks for most infantry and the A.I. comes out with increased morale and units that stay in the fray longer.
Interesting, how easy is that to do? Do you know if anyones done it for RTR 5.4? preferably in a nice tidy package...