The only shortcuts I know of are the ones mentioned in the FAQ.
You can CLICK HERE to visit the FAQ thread.
Basically these are the ones:
-You can use the numbers 1 till 6 to call a group of units (after you've formed them as described above).
-The 0 on the numeric keypad can be used to send vehicles back to base.
-You can press P to pause the game, if you want to continue you need to click on the pause screen with your mouse.
-Press N to toggle between all vehicles, if you find the vehicle you're looking for keep pressing N to zoom in on and track that unit.
-You can press the TAB button to call the mission objectives window and reread your briefing.
-The HOME key (or POS1 key) moves the camera to the point on the map where you're vehicles enter the scene.
-You can turn the lights of a vehicle off by selecting the vehicle and pressing SHIFT + B (together), you can switch them on again by selecting the vehicle and pressing B.
-You can use the F1 till F4 keys to open or close the vehicle menu of the fire department (F1), police (F2), rescue services (F3) and technical vehicles (F4).
-You can quicksave your game using the F5 key, you can load your most recent quicksave by pressing F9.
-Press ESCAPE to open the options menu.
If you know of any other shortcuts, please reply to this thread with the information. Thank you!