I've been using the space > passcode > space technique so far, but annoyingly the initial 'space' keypress sometimes brings up the settings options, which I then dismiss, before entering the passcode. I can't see the pattern of what causes it, quite annoying.
I like @gidds suggestion of keeping the device unlocked, but would worry if I lost the device, or it was stolen (access to email, etc).
The Psion unlocking mechanism on my 3mx was great - a couple of characters, and I was in. The ideal process on the Gemini would be to open the lid, enter the passcode, and press enter - no thinking, and straight into the device.