Free-rolling Rolling Stock....?

I want to use wagons and coaches that don't automatically apply their brakes when uncoupled. Is there any way to edit them or are there ones I can find that do not have the autobrake feature? I understand that any with air brakes would normally stop anyways without air/steam to keep the brakes off, but I want to do some loose shunting without the wagon immediately stopping after the loco reduces its own speed.
Please help, and thanks!
P.S. I use British stuff mostly.

 

Here's some links to freeware rolling stock
1. https://www.trainsimcommunity.com/mods/c1-train-simulator
2. https://railworksamerica.com/

 

AFAIK you cannot loose shunt stock in the game.