Kalroth indicated earlier the opposite, that in cgminer.c.source file it indicated that changing queue, expiry and scan-time on the client will not have an impact on results.
What I indicated was that the client will pick the settings if supplied from the server. If they are not sent by the server, then it'll of course roll back to local settings.
I am talking about this setting in particular:
https://en.bitcoin.it/wiki/Getwork#rollntime