Sorry for the delay, I have had a few things that were happening and I missed this thread. If this is the feature that I think your referring it is not one I have used before
I still think the long press duration setting should change this, it is under button definitions and top box marked "Long Press Duration" in TYT Software. I think if I have understood this correctly you are using the lower feature buttons "Number Key Quick Access Contacts", if this is the case then I think this can be changed to what ever figure is required. I have the Long Press Duration set to 1000 MS which is 1 second which is fine for me.
If I have misunderstood please let me know,