Replicating sequences

I asked this on the slony list, but maybe more appropriate to ask here...

I'm using slony to replicate a database with 200 sequences.  To replicate 
these with slony or our modified dbmirror, the replicator polls every 
sequence relation (select last_value...) on each syncronization interval.  
That amounts to 200 select queries per sync interval.  That can be a 
significant load in our case if we want short sync intervals of 1-2 
seconds.  Naturally, this leads to the idea of triggers on sequences, which 
I know do not exist at present in pgsql.

Are triggers on sequences a reasonable feature request/hope for Pgsql?  

Short of simply increasing the sync interval, what other options are there 
for addressing the performance load in a case like this?

Ed