Would it be possible to add the above features to the plugin?

Thanks,

You can certainly change the chat to another colour, here is an example
{
"No Permission": "<size=17>You do not have permission to use this command.</size>",
"Building is blocked!": "<size=17><color=#FF0000>Building is blocked near treasure chests!</color></size>",
"Max Manual Events": "<size=17>Maximum number of manual events <color=#FF0000>{0}</color> has been reached !</size>",
"Dangerous Zone Protected": "<size=17><color=#FF0000>You have entered a dangerous zone protected by a fire aura! You must leave before you die !</color></size>",
"Dangerous Zone Unprotected": "<size=17><color=#FF0000>You have entered a dangerous zone !</color></size>",
"Manual Event Failed": "<size=17>Event failed to start! Unable to obtain a valid position. Please try again.</size>",
"Help": "/{0} <tp> - start a manual event, and teleport to the position if TP argument is specified and you are an admin.</size>",
"Ladder": "<size=17><color=#FFFF00>[ Top 10 Treasure Hunters (This Wipe) ]</color>:</size>",
"Ladder Total": "<size=17><color=#FFFF00>[ Top 10 Treasure Hunters (Lifetime) ]</color>:</size>",
"Ladder Insufficient Players": "<size=17><color=#FFFF00>No players are on the ladder yet!</color></size>",
"Event At": "<size=17>Event at {0}</size>",

As for changing the icon there may be a plugin that will allow you to do that.

Thanks...I have tried both Chat Prefix and ServerChat and neith will change the icon 

Gimpy

Thanks...I have tried both Chat Prefix and ServerChat and neith will change the icon 

https://umod.org/plugins/custom-icon

Damn....Thanks man i will give it a try