Set OS to always mirror displays

I often have to do presentations where the projector is not powerful and it's incredibly difficult to see the cursor on some setups.  Thus it's easier to look at my laptop, rather than the projected image, ie I need things mirrored. 
On my previous mac, it seemed to remember my previous settings and always mirrored displays.  On Mountain Lion, it does not mirror by default and it's then very difficult to operate the machine because the resolution (on the projected image) isn't high enough.
Wondering if there's some thing I can hack, or a maybe an obvious setting I'm missing, so it can default to 'mirror displays'?

Thanks for the reply Cattus Thraex.  I don't think you fully understand my particular issue:
1) hook up mac to a new, inferior digital projector
2) mac defaults to 'non mirrored', my laptop only shows what amounts to a blank screen, while the actual desktop is being projected
3) but the projector is not good enough to do fine detail; even getting it to 'mirror', so that I can "drive" the presentation through my laptop is difficult.
Previously, this is what happened (before I had mountain lion)
1) hook up mac to a new inferior digital projector
2) it seems to remember my preferance, everything is mirrored
3) I start working
It's like mountain lion tries to outthink itself when interfacing with a new device, saying "i'm going to default to what I think is best, not what I remember from your last device".
Not sure if that explains it.  The easiest summary is: I want the OS to always default to 'mirror displays' when detecting new displays.
Thanks for your help

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