Yes, firmware on the Advantage 2 (what I have) does allow some QMK type stuff like mod-tap. They call it "tap and hold". It's more limited than QMK from my understanding (e.g., only 1 layer, tap and hold only on certain keys) but for my uses cases it's been fine.

While it's not a true split, the key wells are ~6" apart which is plenty IMO. They do have the similar Advantage 360 Professional which is a true split and uses ZMK for more programmability.