I saw in the now the CPUQuota can be setted in the GUI.
It´s limited to 100%, but if the computer has for example 4 CPUs the maximum would be 400%.
please try this: https://raw.githubusercontent.…gined/rpc/jdownloader.inc
replace it with your local file usr/share/openmediavault/engined/rpc/jdownloader.inc
then restart openmediavault: systemctl restart openmediavault-engined