Improve K9 unit:
Give the K9s improved animations, and a proper tracking ability. Instead of just usernames, in-game character names should be used. Also give the ability to sniff out narcotics, and weapons. Make it a chance thing, where sometimes they don't detect it, or bark, and it's a mistake.

SWAT Unit:
Make it possible to drag each other with a specific vest to get them to safety. Improve breaching methods, the ballistic shield, and HCSD gear. In addition, add more ways to enter the house, and give them a picklock.

Other:
Give FD a Lock Out Kit for people trapped in cars, and give people car keys to trap people in cars 💖

Criminals:
They need lockpicks, to burgle places that are locked, for an example the local Target after hours.