Well you might be able to use a drop down box type profile field since you can could use different preset intervals. I think that would be okay.
It may be a little trickier for you however since I think each drop down is given a numerical value starting at 0. So if your presets were
5 seconds = value in db 0
10 seconds = value in db 1
The variable you will want to use is (I think) $bbuserinfo[fieldx] where x is the custom field #
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