No, I'd prefer to avoid bringing in too much UA content.
I'm not sure if there's a clear choice for Favored Enemy. There's a lot of different enemy types to encounter, and even the Zhents aren't really the primary enemy. You will fight them a bit though, and I will allow Favored Enemy (Zhentarim), but not the rest of Urban Ranger. And just to clarify, if you also take FA(human), the bonuses do not stack.
Not sure where corpse creature is from, but per my previous ruling, races are limited to PHB races or FR variants with LA +0.
Fractional BAB/saves is fine.
Skill points are retroactive. You have to buy regional feats as normal.
No. As mentioned in the alignment section, characters should be "Good or light-ish shades of neutral". I would also prefer to avoid bringing in PrC's outside of my initial allowed sources.
Not quite. You can wield a shield in addition to your lance when mounted. So you can't use a larger lance or do something other than hold a shield with your off hand, but you can get two-handed Strength and PA bonuses your shield, which is pretty nice.
At this point, I will allow PHB2 material as well.
In this adventure, you might or might not hit level 7. A lot of these older adventures are a bit more open, so it depends on what path the party takes. I might see about extending this to lead into the Return of Randal Morn questline if things go well, so it might be worth thinking about what you'd do in a few more levels, but no promises.