That has been available in SP since 6.7.2.Check the DCR component guide example. Open the page and click on the field.
I am talking choice 1.Look here:/default/main/component-guide/WORKAREA/shared/sites/Component Guide/Marketing/Form Builder/
sorry, wrong path/default/main/component-guide/WORKAREA/shared/sites/Component Guide/Marketing/Content/FormsPublisher Content.page
Those are your *supported* options. :-)!
InterDev, We have a similar requirement to allow inline editing on the page. Have you been able to do this?? Please share some tips.