Bukkit

The Problem
I think that there could be more options to chat formatting. One plugin, Essentials, allows for the following options:

http://wiki.ess3.net/wiki/Chat_Formatting

{DISPLAYNAME} {MESSAGE} {GROUP} {WORLDNAME} {SHORTWORLDNAME} {TEAMPREFIX} {TEAMSUFFIX} {TEAMNAME}

However it also falls short. It is missing the option for player prefixes and suffixes along with group prefixes and suffixes which are key to the chat of a server. The way "{DISPLAYNAME}" or "%dpname%" work are no where near as beneficial as the prefix and suffix system.

The Suggestion
I think adding in all of the chat variables essentials has, plus the prefix/suffix system would better the plugin as a whole.

https://www.massivecraft.com/factions-owner#chat-format-tags

Faction based variables would also be nice

The hChat plugin allows:

%%    Percent symbol
%n    Player display name
%N    Player real name
%r    Receivers display name (for tell command)
%R    Receivers real name (for tell command)
%m    Chat, death or me message
%g    hChat group
%G    Permission plugin group
%p    Prefix
%s    Suffix
%t    Time (HH:mm:ss)
%T    Short time (HH:mm)
%w    World name
%h    Health (currently not functional and can't be fixed a.t.m.)
%H    Health bars (currently not functional and can't be fixed a.t.m.)
%f    Food (in percent)
%l    Exp level
%M    Game mode
%x    x location
%y    y location
%z    z location
%S    Server name, configurable in server.properties (server-name)
%o    Number of online players
%O    List of online players, comma and andpersand separated
%v    Bukkit version

Which may also be nice to see

These are all things that are long and boring to code. I will setup Vault however if Factions and other plugins don't use Vault im afraid it's not going to work.