using OFP's voices

[OliverPA]

I've already posted this question in this board's sound section.

Let me first apologize for posting this very basic question that really should be answered by one of the many sound/voice related posts and tutorials on this and other sites.
However, I've been searchin' and readin' and searchin' some more for many, many hours but the answer still eludes me.

I quite simply want to use the many in-game words, ie. have a character say eg. "don't fire! friendly soldier at 2 o'clock". OFP has all the neccessary voice files, but how can I use them?
Here's what I've learned so far:
To use a sound file with the say/radio commands one needs to define them in description.ext as CfgSounds/Voice or Radio - no problem and easily done. Some of the files in voices.pbo are declared in such a way (eng1,eng2,...) but the majority of files aren't (true?). The in-game CfgVoice declarations define more than 250 words, but their names don't seem to be usable.
I've also tried creating my own sound/voice/radio-classes referencing the in-game sounds, but none of them worked unless I copied the files into the myMission/sounds folder - not acceptable.

Frankly I'm getting quite frustrated because surely the answer can't be all that complicated for a simple task as this.

I still can't believe that a game would include all these sounds with no access for mission editors...