Custom search on numerical tag

Dear all,
In addition to our personal bibliographies, we use zotero to keep track of all the publications of the members of our laboratory (over 200 people).
Unfortunately, some entities still use impact factors and ask us to produce bibliographies listing our publications in journals with an IF above a given value.
So we've started inserting a tag containing "IF=XX.X" (where XX.X is the numerical value of the IF) into each entry in our database.
But I can't search or sort on this tag using the numerical value.
For example, searching for all references where IF>5.0
Does anyone have any ideas on how to search for tag using numerical values?
Thank you in advance for your ideas/suggestions.
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