Well, I'm new to the game, but since one of my pet projects is, well, revising the Revised edition, I'll take a stab at your questions (I'm gonna have to deal with these issues one way or another, in any case).
1. Looks like a typo. Considering the 2010 Compendium (where I believe the legion fleets were introduced), it had a cost of 380. Since this appears to have been deliberately changed in the actual profile of the ship to 360, I can only assume that the intent was for the BFG:R version of the Conqueror to have a cost of 360. In general I go by the cost shown in profiles rather than in the fleet list.
2. I'm not sure about this one. Could be a typo or deliberate balance thing, but I haven't done enough research (looking through some of the old BFG:R threads on here, as well as the old publications) to know for certain. I'll get back to you if someone doesn't answer.
3. I think it's an oversight. Pretty much everything in this game is "round-up" except a few very specific scenario/victory point conditions.
As for your last question, I don't think BFG:R is being actively updated right now. That being said, I'll have to fix these issues for my little revised/revised project, if I ever get around to releasing it.