Windows 8 mail client - change activesync screen lock setting?

[AWS]

So I have configured my Windows 8 Pro RTM (TechNet) to connect to our Exchange server. However it enforces the policies, which is fine, but the screen timeout is set at 1 minute. This is very annoying. Is there anyway to change this setting? This is not
the server limit, a phone on the same server is at 5 minutes, and can be changed to e.g. 30. Is it possible to configure this on Windows 8 anywhere? Doesn't seem possible in e.g. the screensaver or power options.

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