How to create easily variable unit range

[Drain Pipe]

I was playing around with things and I remember someone mentioning how you could have complete control of unit range by setting a units attack and acquisition range to the full map bounds and simply modify unit orders and acquisition range so that they would only initiate an attach at the proper range. The alternative was supposedly to update unit attack range. Is there an existing system or different/better way to achieve this?

 

[Xonok]

That's pretty much how it would work. If the range is too high you give it a patrol or move order targeting the unit it tried to attack. Then when it gets close enough you give an attack order again.