Hi Tony, and welcome to the forum!
Indeed we can use different "gestures" like single tap, double tap, tap and hold to send different MIDI messages (or keystrokes). I think the success of this will be largely dependant on what Serato DJ allows. What mixer do you have? I have a Pioneer DDJ-SB3 and although I've been successful in MIDI mapping with other MIDI software, I've had troubles with Serato DJ primarily because:
1) Serato DJ seems to want a direct connection with the USB port and I have trouble using virtual MIDI ports with it.
2) Serato DJ seems to be a hybrid MIDI and HID USB port so I beleive some mappings are not MIDI. For instance I cannot control the LED's of Track-3 and Track-4 no matter what the DDJ-SB3 documentation says.
See the below post for an example of using gestures:
https://www.bome.com/support/kb/double-tap-midi-input
Steve Caldwell
Bome Customer Care
Also available for paid consulting services: bome@sniz.biz