Zero Fly

This only works on the original 2004(?) PC release, and the original PS2 release. It was patched for Legacy Collection 2, along with the shop's money underflow.

If you are holding Up when you press down (including any left-or-right diagonal), Zero will fly up instead of down.

On the original PC release this can be done with any mappings of up and down. 

On the PS2 release, this is possible because the game accepts directional input from both the left control stick and the directional pad. How you achieve pushing all of the required buttons at once is left to the runners.

• some players have a claw grip to flick the stick
  
• MrCab flicked the control stick against his chin (SGDQ 2015)

Release attack to stop flying. Keep in mind a few scenarios can lead to soft locks when using this.