Development topic: http://gtaforums.com/topic/467104-cleo-vice-city-radar-zoom/
This mod simulates GTA IV's radar zoom feature. Press the "T" key to have the radar zoom out. Hold the key to keep the radar zoomed out or release the key to revert to its normal zoom level. This mod utilizes CLEO Library v188.8.131.52 for Vice City, developed by Seemann, Alien, and Silent.
Silent created a radar zoom mod for San Andreas based on my code. Check it out here.