The ability for a drawing to automatically regen when a dynamic block grip is moved. Perhaps all that is required is an extension to the FIELDEVAL system variable ti 'update on grip edit'.
Another solution would be to have an additional action in dynamic blocks to allow a script to be executed under certain events and a number of events to be created to accomodate the variety of actions that you might want to trigger a response ie grip moved, post block placement, pre block placement, parameter value change etc....
