Password protection at boot time?

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I really really miss a feature in WinMo (at least, can't seem to find it) that lets you password protect your device at boot?
I don't want a pin-based lock each time I resume my phone, but preventing people from booting the device (and preferably accessing the data) without correct password would be great!

Any ideas?

i have windows mobile 6.5 and i have tweaked it so it'll autolock.In that way, every time i do a soft reset,i have to enter two passwords.My phone's password and my SIM password.But sometimes it's annoying me