snget and the right time.

I'm quite a newbie to News and just set up sn for the internal network with 
some local groups, and one group from the providers news server.

currently i just call snget per cronjob every view minutes to keep that extern 
group up to date.

Is there eventually a way to sync immediately after posting? i tried to write 
snget into /usr/sbin/POST, but it blocks the client until snget finishes. And 
it would be cool to sync when a client connects and looks for new posts in 
that group. (maybe except if the last snget did just run a view seconds ago)

Also, there sometimes are network problems. is there a way so the new postings 
do appear in the group and sync later? (otherwise users might re-post 
indefenitely when they don't see their post)

Thanks for any hints you can give me

Worf