Here it is from the Audrey FAQ (In case you hadn't found it). I'm guessing that you can tweak this to where it may only check once a year... that's pretty close to what you wanted:
In the /config diretory you will find a file kcrontab. Using vi you will see a line that looks something like this:
app; min; hour; day; dweek; month
You can either change the number (in this example 54) to a * and it will update every minute, or you can add 12 lines all the same except for the minute 5 , 10 , 15 etc.... and it will update on those minutes past the hour.
Note that you will need to reboot Audrey for these changes to take effect. Also note that if you make changes in the "Download Schedule" applet control, that these settings may be overwritten.