Boost & 2 backends synced with csync2 (compatibility question)

Hi!

We are using a couple of back-ends (Apache) with DocumentRoot synced with csync2 (two-way). So it's shared-nothing configuration without external shared storage like NFS/GFS/OCFS2/etc. We have small caching time in Boost (1-3 minutes) for most of our pages. Is it possible to setup/extend Boost to keep separate caches (i.e. creating cached pages and expiring cache is per-backend) and relative DB info is per-backend. The only compatible way (for now) to run Boost in our configuration is old "No DB" mode.

As I understand, now there is not any way to setup boost on 2 backends without some type of shared storage, but shared storage is not very good for performance and complexity reasons.

P.S. Thanks for Boost, its performance rocks!