Answered: Is it possible to add some points for login activity to a user account?.

I've created this pull request: https://github.com/q2a/question2answer/pull/486. It allows plugins to interact with the points system directly. You can try to implement it on your own and see how it goes. This means, modifying the Q2A accordingly, and also implement the plugin logic to increment points.

A significantly less efficient alternative is to take a look at how the Points Recalculator plugin works. I'm sure that site has it installed. Similarly, to the previous approach, the plugin that wants to increment points will need to interface with the PR plugin to perform the point increment.