Forge 1.9 Item merge radius

Is there a way to change the item merge radius with forge 1.9? I used to use spigot server & installed this on the server but it clearly overrides the the following code spigot uses

merge-radius:
↳ exp
Default: 3.0
Type: Integer
Description: Controls the range - in blocks - which experience orbs will "group" together when on the ground.

↳ item
Default: 2.5
Type: Integer
Description: Controls the range - in blocks - which items will "group" together when on the ground.​

This was very helpful when mining because it merged the dropped items together of the same type. Now it just scatters all over the place & very annoying.

So if there's a way to edit or add this, I'd love to know!

Thanks in advance!