I can have a look if I can add something to FCOChangeStuff.
You can use this script to stop the blinking, enter it in the chat:
Code:
/script CHAT_SYSTEM.notificationPulseTimeline:Stop()
Or this to hide the texture which does this blinking, so maybe it will be hidden for all time then until reloadui
Code:
/script ZO_ChatWindowNotificationsEcho:SetHidden(true)
Unfortunately this will start to blink again as you reloadui, chnage zones, etc. So I'll have a look if I can stop the animation at these times automatically and as new notifications are incoming.