With this mod, you will be able to visualize orders of your selected units, as lines between the units and their target (destination or another unit/structure) and an ellipse around the target. This should be compatible with all normal Starcraft systems (saves, campaigns, multiplayer, maps), which is why this is published that way at least once (those features may be merged in futures mods). Made from the General Plugin Template Project (GPTP) for Visual Studio 2008, a tool to make a mod using C++ for Starcraft. See description for more details. ----- V2 came out, check description of the download to know more.
Bases defenses and siege tanks have their range displayed as long as they are selected.
Same thing for reavers and carriers, as long as they have units to send at the enemy.