Two questions about caching css and logo changes in a plone site - while 
experimenting with new logos or css in a Plone site in a larger Zope 
instance:

1. In spite of what a lot of documentation says, in pointing me to  * 
RAM Cache Manager*, and * Accelerated HTTP Cache Manager,  *the*** *key 
seems to be to go to the root of the Zope instance, at 
/Control_Panel/Database/main/Flush Cache -> minimize. That always does 
the trick, while setting the "time to live' in the RAM Cache or the HTTP 
cache does not a thing.

Oddly, the Zope book and the Definitive Guide seem to be silent about this.

Is this documented in any official sources? I dug it up in support 
forums on Zettai, e.g. 
http://www.zettai.net/Forums/04/1086367653/talkback/1086367552

2. Is there a way to give the admin of a subsidiary Plone site the power 
to minimize the ZODB as above (or flush the database cache in some other 
way), without giving them admin access to the entire Zope instance?

Thanks.