pardon the n00b question but, does cpuminer have any facility to detect when the current block's been solved (so that it can drop what it's doing and begin new getwork() or is that what the scan time discussion is addressing?

i'm wondering if cpuminer is (or can be made) intelligent enough to not continue to working on the old block, submitting stale shares somehow.. (i'm thinking of setting up pushpoold if that'd help).