ScraperWiki has an employee who has to be in a location to work but only 2 days a week.
We've dealt with this with a monkey patch at the moment adding this text to the end of the location section:
"For the avoidance of doubt, we may not require you to work in Liverpool more than 2 days of any week. Not withstanding whatever else this contract may say. (This paragraph is a variation from the OEC 1.0 standard agreed between the parties)"
And in the "Range of alternative locations" box putting "Liverpool (you will not be required to work here more than 2 days of any week)"