I used the drivehold function as well and it is very effective but the new functions give it a touch of more drivability.
I tend to run with medium acceleration CV3 = 90
Deceleration CV4=150
Now this means from full speed the Hunslet file would likely take over 2 minutes to coast to a stop!
So this is were the brake function comes in.
Using The Lokprogrammer I set the Brake1,2 & 3 on the file to simulate a light brake application, a service brake application and an emergency brake application!
The brake values on the file I set at 120, 160 and 200 accordingly. I also modify the function list to include these.
I use the Z21 app and include a screenshot.
Clear as mud!