Since this is not a feature suggestion topic, but a question about how to record pitch bend to automation: The Duplex Keyboard application can map pitchbend and channel pressure to CC’s, which you can then assign to any parameter (including the pitch-bend param- of the Instr. MIDI device).
While it allows you to record directly into an automation lane, it doesn’t increase the recording resolution. Although linear/curve interpolation goes a long way toward making the envelope appear more smooth, the automation recording resolution is still limited to one point per line.