Hello
Seblod, out of the box, extends native Joomla objects: articles, users, groups and categories. It relies on the storage location plugins that come with Seblod.
Of course you can create fields that are stored at the same database location as some third party extension objects but it won't give you all the dynamics of the extension.
From my experience I see 4 ways here:
1- you developp the whole application with Seblod alone
2- you keep the extension and use Seblod for 'external' additions (such as lists or managment interfaces on the extension)
3- you developp a custom storage plugin for that extension which is tricky since it means you mimic most of the original mechanisms of the extension. In other words you redevelopp the extention with seblod. This way you can add whatever you want in the "sebloded" extension
4- you find a way to trigger a php code when the ticket is closed with sort of rsticket plugin. In this plugin you call some functions that modify the seblod userpoints
cyril