With the update, it seems pretty much perfect... played two of the later terran levels last night using just the touch screen and keyboard... very playable.
The only real complaint I have about using the touch screen is it can be tricky to be precise with building placement... as essentially there's no hover....
Hmm, I must try this when I get home... but would it be possible to use left nub as mouse hover, the keyboard for commands and press enter when you're happy with your building placement to execute the command.
Using the nub and stylus together for building placement could work, as long as you remember to tap exactly where the cursor is.
I still get some hardly noticeable slow down when scrolling with the dpad.
I must do a more accurate test, but this game appears to drain the battery fairly quickly.