Omni Preview allows you to map channel rack drums to MIDI Keys or Drum Pads without using the FPC plugin to trigger notes in the Channel Rack starting from C5 and only using white notes!
Omni mode in FL Studio allows you to set up one knob to control the same parameter off similar channels. Use it with Pickup (takeover mode) for a decent hands-on FL Studio mixing experience.
How to fix mod wheel in FL Studio by enabling omni mode, and assigning modulation wheel to CC #1, which is the MIDI Specification. (And setup mod wheel as a global link).
How to Fix the Pitch Wheel and Mod Wheel in FL Studio on your MIDI Keyboard.