He will likely tell you the same thing. There used to be a paid (ew) 3rd party plugin but the site has been down for a while and the plugin hasn’t been updated for latest codebase in a while. So it appears you are out of luck here.
In v2.0 we will have better plugin extensibility that will make such features possible. For now, there are no core plugins and doesn’t appear to be any current 3rd party ones.
3rd party mods/plugins/etc. are never recommended. They are not written by, not reviewed by, not maintained by, nor supported by us (osTicket). With this in mind you should always proceed with caution. Any use of 3rd party mods/plugins/etc. will be done at your own risk.