The activity of selecting and unselecting values in 3.1 would require a refresh which I dont think is designed by default into that version.
The prompts in WRS 4.2 are much different. When using timestamp or date formats, the prompts are geared toward dates and date ranges rather than item selections.
For instance on a date time field, I added a prompt with a default value of current hour. When in WRS - I see a drop down box for different selections - such as prior hour, current minute, n minutes ago, etc. There is also a calendar icon that I can select a specific date to use.
When creating a date range prompt this filter operates almost the same way, but then you create two prompts for beginning & end selections.
Angela Hall
Zencos Consulting
http://www.zencos.com