I'm been preparing my ant build to prepare war file and now I found that command line deploy would be very usefull.
FWIW, I put Designer's project's directory inside eclipse's project, add to version control (SVN, sorry but haven't time to test GIT and GIT's plug-in...), SVN ignore in deploy folder (WebContent/app and Designer's generated files like view, store and so...) but before I run my ant tast I have to manually open the Designer's project then "deploy".
So, it would be nice to have Designer's command line option to generate js files.
PS: Even with it's current limitations, NOW Sencha Designer REALLY cut my development time! My credit card cut is 28 of each month so just waiting to march cut to buy it!