Is anyone using 4.0.3 able to report if this working okay?

working fine.

btw, dartho, you might wanna add "display: inline" for tag li elements.
or better yet, remove tags from mobile display.

if I already have a custom style, will I be able to also have a mobile style that only works if it senses a mobile device? or am I stuck with generic style for PC, and mobile style for handheld?

you can have as many different styles as you wish...

Please who can explain why when I try to edit the "forumhome" template I get this error:

I have this same problem. The disable code above did not work for me either. using the same mod as reported by the user above.

I was able to easily solve this problem. The mod reported above has an option to ignore for specific styles. Just enter your mobile style ID in there and problem solved.

Thanks momon.
I had not noticed that option.

This style has templates in v3 format. "Mark forums read" don't work (template needs to be corrected).

Try to mark all forums read ;) It will throw error.