Urgent: Nesting of OSCache tags

Hello,
 
I have some questions regarding nesting og cache tags, which I hope to
get your opinion on.
 
We're about to go into production with a site that uses nested cache tags
for caching of both HTML pages and HTML fragments (partial pages).
We're dependant on caching HTML-fragments to meet get the required
performance.
 
We've been testing use of nested tags using OSCache even though the
FAQ clearly states that this is not supported. All the same, it seems to
work well. Still, we're reluctant to go into production with nested tags if
this is an unsupported feature.
 
Question #1:
What are the consequences of nesting tags in OSCache?
 
Question #2:
What would you recommend as a workaround to get nested tags
working? We're looking into using BEA WebLogics own cache tags for
the "inner" cache tags (fragment caching), but we're not quite content
with the performance and quality of this cache. Using OSCache would
be preferable.
 
Hoping to get some advice. :-)
 
 
Best regards,
Bjorn Wang