I've never really heard much, outside of a few things, of Lucas taking direct interest in EU really... rather I've heard Lucasfilm had oversight of EU that became more strict as time went on, but in the earlier days of it, it was fairly loose as I understand it.
The only things I've heard him having a direct interest in that got much notice were Clone Wars and, seemingly to a lesser degree, TFU. Can't recall much more. I seem to recall even reading somewhere he really didn't care for some of the 2D CW toon even.
TOR he's seemingly not taken much interest in... Maybe it's the era being so far away from "his baby"? He outright argued with others within LFL when they pushed for the name Coruscant to be adopted for the city planet in the prequals, or so the story goes anyway, because it was established by Timothy Zahn.
He openly criticized the notion of bringing Fett back from the Sarlacc, laughing at it, and saying, "In my vision, Boba Fett died in the Sarlacc and that was that". I'll never forget how he kinda looked down on the idea even. I think that was the first time I saw him sort of turn his nose up on EU a bit publicly.
I guess I just haven't seen much to make me think, outside of the new CW toon, that he's hands-on... I think he has people who are, and I do think it's a more controlled thing NOW, but I think if you look at anything prior to 1999, at the earliest, he really just let things go wherever the $ took them. I think maybe the Prequals (and thus more and more EU coming out) had him reign that in with a team, and perhaps himself more than he had been. Still though, even the CW seemingly has pushed some things that Lucas himself seems to have seen no interest in tying to the established EU... The Y-Wings came to mind instantly really.