Request for holding note option

Hi
Can we holding/sustain note option for xkey plus app?
I mean when we hold key or keys on xkey device,that notes play without releasing note ,even when we release our fingers on keys untill we hold or play the new notes or chords p: previous notes releasing and new notes holding automatically.
There can be two forms:1: sustain toggle 2: sustain latch
If you switch to Toggle mode, then each time you press a key, it will start or stop playing. This can be useful, for example, for long pad chords where you want to slowly change the notes that make up the chord.
If you switch to Latch mode, then notes will keep playing, until you play a new note. Then, the old note will stop and the new one will start. You can play chords, too, and all the notes will be “latched” down after you let go, until you press a new note (or chord). You can even add notes one-by-one as long as you’re still holding down at least one note before you play another.
I am waiting for your answer for this request.
Best
Pejman