Additional Queue setting for ServiceLevel

Hi,

Does a way exist to add an additional setting for a queue?

I need to add a ServiceLevel=30 setting for a queue. This is not included as standard in the GUI so in my wisdom I though I could add a section like the following in the queues_custom.conf
[queuenumber]
ServiceLevel=30

My thinking was this would add the setting to the already defined (by FreePBX) queue definition in queues_additional.conf. However it looks like it overwrites any settings in FreePBX.

Thanks.