Davor,
I decided to go with my original method of compiling the QPSQL Driver as a library. I can't remember the road blocks that got in my way, but I could not find a suitable way of transparently making it "just work" no matter if the Driver was a plugin or a library.
Really though, it has not been an issue to compile the QPSQL Driver as a library... the only downside is I have not been able to use the pre-built SDK's... but have had to compile Qt myself.
If you end up coming up with a method that works for you, I would love to hear about it.
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