New feature suggestion and a bug

[Harvle]

BUG:

Plugin Version: 4.1.1

Issue Type:
Custom heads from the website listed in the wiki page (minecraft-heads.com) do not work.

Error: Item in GUI either shows as the "INVALID ID" message or just a regular Steve or Alex head.

Possible solution:
Update the API to support this again in the latset version.

Comments/More info:
Server version: Spigot 1.12.2 (offline mode, runs on a bungeecord server configured correctly to show this)
Plugins used that may help or affect this: PlaceHolderAPI, CMI, ACM, ACIAPI

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SUGGESTION:

In the config.yml, could you make a "refreshGUI" option, and an interval for it too, which will allow the GUI to update. For example, if a user has their permission removed while they are in a menu, it can refresh and they will not be able to use that item. An example of this could be a menu where you have some "options" configured. I have a menu where I can switch switch tablists based on a permission, and i set it to true or false when the item is clicked. Rather than having to open the menu, click, then close and reopen it to edit the tablist setting again, it could be automatically refreshed every second.

I hope you add this feature. Thanks!