Ability to select multiple versions when creating a new card

In JIRA we use either the auto-complete renderer or the select list renderer for the Affects and Fix Versions fields, both of which allow for multiple versions to be selected. When creating a new card in GreenHopper, the only option is a drop-down list which allows only a single version to be selected.

You can edit it later, but it should be possible to select multiple versions in the first place.