[Zope] Changing cache paramters in Zope 2.7

[Petter Holmström]

Hello,

How do I change the value of "Target number of objects in memory per 
cache" in Zope 2.7rc1? The field is not editable in the Control Panel, 
and I have not found anything in the zope.conf-file either.

Thanks in advance,

-Petter-