1) Conversion to and from FormBean to ValueObjects (though 
it can be achieved with one line statement using 
BeanUtils,but a automatic conversion would be desired)

2) Passing a subset of ActionForm through the Action chain
(using seperate set of ActionForm for a single HTML Form)

3) Using ActionForm not only as a carrier of data from HTML 
forms to the Action but also to display data after 
executing the Action

4) Changing the execute() method signature to pass only the 
ActionForm and ActionMapping, and no
   HttpServletRequest and HttpServletResponse objects. 
Struts should be protocol agnostic.

5) Replacing static ActionForm with DynaActionForm for all 
cases. ActionForm should be dynamic enough to include 
parameters that are created dynamically using javascript.

6) Though not part of core Struts, having a sophisticated 
Struts tag library,like displaying tabular data with run 
time selection of style sheets,would definitely be handy.

7)Struts developers have completely rebuilt the 
RequestProcessor using the Chain-of-Command/Chain-of-
Responsibility (CoR) 
  pattern implemented in Apache Commons-Chain