If the data-provider for your portlet is an
object ; then yes, you can edit fields via that portlet.
If the data-provider is a NSQL
query ; then no - these are read-only, you would normally build a link from your read-only portlet to the underlying data.
(as an aside - you can get the boolean to display as a check-mark (or a limited variety of other icons) rather than 1/0 by setting the display mappings in the query and then setting the field options in the portlet to display as an image)