#1 Flying Characters: Yeah, that does sound reasonable, as Variant Winged Tiefling is a thing I know I will be playing xD
#2 The Point Buy we set up is still Standard Array. All we did was expand the bottom/top caps, so you still use the same amount of points as Point buy. We did plan for Races such as Kobold and Orc (Not half) that get -2 to Str and Int respectively. Thus even 6 Base -2 Racial Modifer Orc will still have 4 Int and be sentient. The same is set for starting, so that 17 Base +2 Racial will still cap at 19 starting and only lvl 4 will give a player their first Nat 20 Ability. Remeber, 7 and 6 only give 1 point each, while 15+ costs 3 points each. One does need to take SIGNIFICANT negatives to get that 16/17 in a stat.
#3 Revised Ranger will be a no I think because of how all UA Sub Classes of the Ranger only interact with the PHB Ranger and no the UA Ranger. The Mystic classes has already been deemed a very clear NO from multiple DMs. An experienced player can break the game with Pure PHB, UA does NOT break the game nor is it OP. What we look to curb is players playing characters that are good at too many things. No Rogue wants to play with a Monk Warforged with Expertise in Thieves Tools who does all the sneaking, lockpicking and basically frontline Rogue. Our goal is that play is FUN, so that a hardcore min/maxer and the newb can sit at the same table, and both feel impactful and important to the session and the story.
#4 When a party finds a magical item, people who want the item can discuss who gets it, but the DM does have the right to award the item if there is no consensus (whether by dice roll or awarding the item to the player with the least amount of magic items)
We do plan to balance players: not by restricting the players mechanically, but by educating and teaching them game etiquette. We trust our players to not cheat and players who do cheat will be restricted and/or removed if they are not remedial.