How to add new points option through a plugin?

Question

I would like to add new options in 'Points' tab using a plugin. e.g. if user visit the site or add a comment, user could earn a point.

how could I do? any existing code I could follow?

Comments

Suresh, thanks for your explanation and revision for betterpoints.

I tried your latest plugin, I got database error when I recalculate the points. I suspected it is due to exam and pblog calculation. should I install any other plugin?
also I am interest about exam count, how could I try it?

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Oh, they should not cause any error even if those plugins are absent. Could you please give the exact error you got?
Exam count is from another plugin but not free,
http://www.question2answer.org/qa/53249/anyone-interested-in-fully-featured-quiz-for-q2a

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thanks. sent you email about this.

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one more question. after I setup comment-vote and betterpoints, it works with one problem.
the comment vote up/down button only shows when I edit a comment. the button doesn't show up in display mode.
I noticed that in gateoverflow, the buttons always show.
any issue in comment-vote plugin?