It would be nice to have support for WD scripting in something like notepad++. The editor in the Widget designer right now is a bit spartan.
It would be usefull for scripting functions for starters. (maybe also multiple functions in one file)
Other long-term nice to haves would be, in no specific order:
The possibility to dynamically attach events to objects on the interface.
Dynamically adding/deleting objects.
local variables within functions (no need to show up in the variables section)
XML parsing. (eg. configuration files)
DOM support for all objecs