Simple plugin to write a value in a database

[voltron81]

Hi to everybody.
I'm looking for a very simple plugin that give the opportunity, with radio button or a slider, to write a value (let's say 0-10) into a database.

Basically with ISPConfig3 I've created 11 spam rules and I know how to change the values on the database.
So basically I need a roundcube plugin who create a new section in Settings and save the value that the customer will choose.
This plugin will do a select to the ISPConfig Database like that:
INSERT INTO spamfilter_users VALUES ('value1') where email = username of roundcube.

Do you know how to make it?
I was looking some plugins, like SpamAssassin MySQL Plugin, but they are quite difficult to understand how to write it with roundcube...
Any suggestions?

Thanks a lot
Michele