How difficult would teams be to code?

[Faerie]

Anyone that has worked with this sort of thing?

How difficult would it be to code in:

Softcoded race-based teams
Hardcoded race-based teams
Softcoded deity-based teams
Hardcoded deity-based teams
New Race/class/deity combinations
Ability for players to switch between teams
Nametag colors representing team
Custom teams rules (one team allowed to attack their own, basically FFA for one team; crossteaming between certain teams but not others; etc.)
Ability for devs to disallow character creation on certain teams
Ability for devs apply incentives to certain teams (increased exp rate; etc.)
Item loot
FV no drop rules
Custom items able to be looted from enemy player corpse killed in pvp

And anything else you can think of? I'd just like to know what is impossible, what is easy and what is difficult when it comes to coding these things in.