You could create a custom event module that awards 25 points on every u_register event awards 25 points to the given user. To do so you need to update the field "bonus" in the table qa_userpoints, if I'm not mistaken.
Or you could override the function qa_create_new_user() (also in a custom module) and do the database update there.
Is the operation "Add for all users" in admin/points can meet your requirement?
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