Just an update on this: Following a AwareIM update you can now set the Timeout in the Control Panel under the Settings tab. If you set it here then there is no need to adjust these config files manually, they will get adjusted for you when you restart aware.
Also, if you are adjusting manually, note there is a difference between the BASServer.props and webapps.props file, for example:
60 minutes timeout (set in Control Panel) will result in 3600000 in BASServer.props and 3600 in webapps.props
I think (but can't be 100% certain) we caused some system instability because we were playing around with these figures in a way that was incompatible with each other - be warned.