Honestly, I'm a bit surprised no support has ever come for FL Studio. I love this keyboard, but the lack of support for FL is frustrating to say the least. I understand that FL wasn't initially supported from inception, and both the Keylab MkII and FL support MCU, but the MCU implementation is wonky, at best. I'm a bit let down that no support has been since added, as FL is extremely popular. It really is one of the most popular DAWs out there.
Image Line recently started supporting MIDI scripting, which is great, and a user there just started working on a script for the Keylab 61, but it's just him by himself, and it too is very wonky and brings with it some hiccups. M-Audio just released their new Oxygen Pro line, and it has native support for FL, and I'm strongly considering it... Like, strongly. The Keylab is a superb keyboard, but without full functionality, it becomes more like a board than keyboard.