Yes, it is clear that the goal is to have pitchbend MIDI data out. What is not clear (to me at least) from your wish as it is described is in which mode(s) would this feature be available. Can you or someone else help clarify this on the description, please?
Far from a midi expert here, but I think a midi bend feature would be highly dependent on the device you are sending those messages to. That device would need to support pitch bends via midi input and I haven’t seen any trackers that support that kind of control.
On the other hand, If a device has a built-in portamento (such as a 303), an external midi controller can take advantage of that by playing a second note before ending the previously held note. If the first note receives an END signal, the second note will just trigger an entirely new note without bending.
The downside is that the tracker does send a note END signal when triggering any new note on the same track. The workaround I usually use is to reserve two tracks for that midi channel. Play the first note on track 1, then trigger the note I want to bend it to on track 2. Since the second note isnt triggered on the first track, the Tracker is basically still holding that note down and allows the midi device to portamento up or down to the desired note signal from the second track.
One possible way of keeping it to one track is to implement an FX type MIDI Note Continue. This would tell the tracker not to send the Note End signal when triggering a new note from the same track. And if that FX command is not used on the last note played, the Tracker can again send a signal to END all notes played on that specific MIDI channel.