Puggo - Jar Jar's Yoda said:

Well, there were pan and scan releases before the GOUT.

The telecines used for LD would go straight to what format tape? UMatic? 1-inch? And already letterboxed?

I'm not an expert but I think it was 1-inch before the arrival of D1/2. If you watch the special features for the Star Trek TNG bluray restoration, you see them handling 1-inch reels of video tape from the first couple of seasons which were the original film to tape transfers.

But I'm pretty sure transfers switched to D1 or D2 once those became viable options.

As far as letterboxing, I would say yes. I would think they just had different telecine masters for the LB version and the P&S version. But again, I'm no expert.