This is probably not the best solution, but my situation went like this:
I have a form to fill out in my sidebar, which I want present on all my pages. Well with WPTouch, it got rid of my sidebar.
I found that I could insert the form right before the closing of the content div in the following files:
/wp-content/plugins/wptouch/themes/bauhaus/default/single.php (for posts)
LINE 47, before </div>
and then
/wp-content/plugins/wptouch/themes/bauhaus/default/page-content.php (for pages)
LINE 12, before </div>
So, I put my form html there, and now it shows up on my phone at the bottom of these pages / posts.
I know that I will have to watch out if I ever update my WPTouch.
The nice thing is, it does not show it on the computer / desktop, but I have the sidebar there. Vice-versa, it shows on the phone, but the sidebar doesn’t… no redundancy.