Access to BTemplate on request phase ?

Hi,

is there a way I can have access to the BTemplate tokens while processing
the request event ?

The idea is to have a list of the requested fields from the "client" to
taylor the requested data object from the server tier (using the generic
attribute access pattern and hibernate). The deal is to have a naming
convention accross all the application's tiers.

So... is this simply stupid, or is there a way to achieve this using
Barracuda ?

Thanks in advance,

Franck Routier