Centralize the Cache mechanism simplifying the query creation

Hi all,

in a big project if you have queries spread out in different
repositories,
when you have to modify a cache lifetime, you have to search the query and
modify the code, than test it.
Is not so easy also to answer to 'how much is the cache for the query XYZ?'

the idea:
Each group of repository (bundle) should have in a single point maybe into its config file a place where you could set the lifetime of the various queries.

see the code for a better explanation
https://gist.github.com/3075742

the pro: a better handling of the cache mechanism
cons: ?

Do you think is a good approach?
Have you ever had a similar problem?

Thanks

liuggio