[ESS] ESS and Syntax-tables and SPSS

[Will]

Hi,

Is there a ESS mode for SPSS under consideration?
Where can i find information on how to write an ESS mode, e.g. for SPSS?
How much time does one need to get a simple mode, e.g. with syntax 
highlighting and batch mode integration if one has some basic lisp 
programming experience?
How do I define a syntax-table as a basis for font-locking?
(E.g. the SAS-syntax-table variable looks sort of cryptic containing 
lots "nil" values and "4#" and stuff like that)

Best, Will