How to boost security on tilt windows?

Please bear with me - it's a hard problem to describe, especially for someone who knows little about window design.
Am currently in the market for sliding window locks for my new home (rental duplex). Sure, there seem to be hundreds of different ones on the market, but I can't find EXACTLY what I need (and what will fit).
Specifics: I have several General Aluminum *high performance* tilt windows in the new place, and am looking for a screw-on window lock that will not only prevent up-down travel, but will also prevent the window from being popped open by a hard blow to the (inadequate to my eyes) plastic sliding locks in the upper corners.
The basic hex-key-at-a-30-degree-angle-design lock fits poorly, and the design of the GA's L-shaped channel prevents the lock from fully contacting the frame when tightening down the hex-screw, tightening down at an angle inconsistent with the design... OK up-down protection, but no *pop-open* security.
But ... if I could find similarly designed locks where the hex-screw contacts the window frame perpendicularly instead of at an angle, I could perhaps clamp in an angle bracket flush with the corner of the window and prevent pop-outs... but these types of locks don't seem to exist. The commonly available non-marring wingnut-screw design would work in theory, except that its' tiny jaws will won't fit over the GA's 1/4" lip let alone handle the extra bracket. A hex-key design would also have to have a wider jaw as well - they all seem to be 1/4".
Anybody know:
Where can I find (or cheaply engineer) the kind of lock I need?
or...
How do people make these types of windows secure, anyway.? The basic design seems totally geared toward the clean-freak housewife at the expense of any real security.
Thanks,
Uncle D.L.
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When the windows are closed and locked they aren't supposed to be able to "pop open."
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RBG.
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I'm not familiar with the window, but what comes to mind is not a ready made lock but a means of security. Can you drill a hole and put a sheetmetal screw in someplace? Is there a way of securing a clamp, bracket, or some means of holding the sash?
What comes to mind is a method of securing wood sash windows. You drill a hole through the inner sash to the outer sash where they meet. then you put a metal rod, or even a nail in the holes to prevent them from being pried open. Just an idea that may spark a better idea that works for you. Ed
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