Can we set the MAX RANGE to scan? (ie things outside that range are not visible.)
Also, can we define which objects we wish to detect? (ie Mode 1: Everything, Mode 2: Enemies, Mode 3: Allies, Mode 4: POI, etc.)
Those are good suggestions...
Your "maximum range" suggestion is already implemented. Look at the manual, under the property for "range". Set range to the distance in pixels you want the radar to detect to.
For the select a mode idea, it should be easy to set up using a switch statement inside the Draw event to only draw the instances of the desired type.
The code is well documented and should be easy to modify to suit your needs.