Userpoints Savings Rewards

Hi,

I'm not a professional, so in my eyes it is fairly simple to do but I could be wrong.

What I would like to have is the following:

Idea (and where this request comes from):
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Members can earn userpoints, and in the Ubercart they can spend them.
To motivate them to let them stay longer in their account, I want to reward them for 'saving' them...

Contribution request:
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Give a certain growth for a certain period on userpoints.

How I see this work is that I can choose :
* a ratio
* a period: 2 fields :
* the quantifier (e.g. 2 = every 2 / period) (same principle as the php cron set-up I guess)
* the period (day, week, month, year)

In this way, if I want to give an reward of lets say 1% per month, then I could choose :
Ratio = 101% , quantifier:1 and period: month

Is this something that is fairly easy to do and is there anybody willing to contribute it?

Best regards,
Hans.