Request for assistance with Planescape 4E setting

Naturally, I have them run through low-level adventures first.  The first adventure has them wake up in the wake of a Blood War Battlefield somewhere in the outlands, and they are almost immidiatly attacked by other raiders looking to loot the corpses of the fallen (after all, bring in two-dozen Longswords in decent shape and that's a good haul for a party of first lvl guys, even if none of them are magical!)  They will eventually bumble into Sigil, where they (if all goes according to plan) will realize that they need money if they are going to survive in Sigil for long.  Eventually they will get hired for a couple courier missions, running research notes between scholars for a level or two, all the while hearing that their names sound framiliar.

Meanwhile, a mercenary company hears that these supposed heroes apparantly popped up, and are hired by the Yugoloths to kill them "in case they are those guys" even though they are pretty sure the party is not.  So they will be attacked by random mercinaries for no decernable reason from time to time.

Here are the changes I will make to this campaign, as always, I would love input.

1)Use standard 2nd ed. cosmology.  However, each Prime material plane was 'blurred' creating a shadowfell and Feywild plane on every prime material world.  

2)Use 2nd ed. alignments.

3)The "Analyse Portal" ritual is now a lvl 1 ritual, with normal lvl 1 ritual costs assosiated with it.  It can no longer stabalise portals or determine who went through one last, but it can determine portal keys.  The old "analyse portal" spell is now "manipulate portal" and functions the same.  It, however, cannot stabalize portals going into Sigil (only the Lady of pain can manipulate Sigil's portals)

4)There are no spelljammer ships.  Plane Shift now works as True Portal, except that it will only transport you to the 'outermost' area of a plane.  For outer planes, this means the area immidiatly next to a plane's gate-town gate.  For the outlands, it means at the spire, etc.

5)There is now a new Racial trait: Planar.  Anyone born to planar parents has the racial trait planar.  Planar charactes can notice portals on a successful perception check (DC 20), but can be hedged out by magic circles, and can be banished.  Characters born on Prime Material Feywild or shadowfell worlds are NOT planar, but all Immortals (and thus: Devas) are.  It takes about two or three generations for people to become planar, thus, if two prime elves settled on the planes, their grandchildren would probably be planar.

6)True Portal will also teleport you to most places on the planes.  Places inaccessable by True Portal are: Sigil, some divine domains, the 8th and 9th lvls of Baator, various powerful domains of the abyss, the top of Mount Celistia, etc.

7)I am getting rid of the "Magic gets less powerful the farther you are from your home domain" rule from 2nd ed.  While it kinda made sense, it unfairly punished divine characters, and ended up screwing players out of their magical goodies.

8)Baatorian Green Steel has new rules: When used to make a bladed weapon (such as a heavy or light blade, an axe, a spear, or a polearm), the weapon becomes similar to a +1 Vicious version of the weapon.  It is not, actually magical, thus people cannot enchant or disenchant green steel, but it must be crafted.  However, it remains, to all other effects, a +1 vicious weapon.  The cost is only 4/5ths the normal price.  There exist more rare and purified veins of the metal, which result in +2, +3, +4 etc. versions of those weapons.

When Green Steel is applied to armor (only chain, scale, or Plate), it acts as screaming armor, with the same properties as above (4/5ths cost, not magic.)  Green Steel armor is almost never masterwork (though GMs may wish to allow some masterwork materials if they see fit, such as Gith Green Steel armor, which does not denote what the armor was made out of, but how it was made.)