Hey Terk - can you confirm if your custom stratum software follows the standards (meaning scan-time, expiry and queue settings local to our miners are meaningless), or if we specify settings that they are in fact not ignored?
Those settings are client side only.
In theory Stratum server implementation should send those settings to clients as well as send work restart command as soon as a block change.
Those settings are defaulted locally by the respective miner, or set locally via command line or conf file. Just in case I was mistaken, I just ran through slush's stratum server source and couldn't find any relevant source that would transmit those settings to the clients. I did just work 12 hours though, I might have missed it if it was in there.
Mining clients do move on when they receive a new block message.