I finally got GTA IV to work after i bought it a few days ago and had to troubleshoot with R* support, and listen... I enjoy K109 the Studio like nobody else I know. But TLAD's additions to Liberty Rock Radio have GOT to go. I heard some of it in the cutscene at the apartment and I just had to skip. Couldn't deal. Vibes are OFF!!! I will sacrifice Renegade and China Grove because I just cannot deal with the rest of it. That's how important this is. More important than getting the old music back,
I've figured out how to disable episodic music from playing in IV, without disabling it in the episodes themselves. Basically, e1/2_radio.xml applies to all games, while e1/2_audio.xml applies only to the episode it belongs to. The solution is to just move all the data lines from _radio.xml over to _audio.xml (with the exception of <noloadingtune />)
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(Bonus: it also disables the Funkmaster Flex segment from playing on The Beat 102.7 as it does not fit in TL