I've seen that mobile Joomla is not ideal for a lot of forms, capcha, lightbox etc. It's not a big problem I guess because people who wrowsw your website with a smartphone probably won't fill forms and view photo's bt want info about your location and send a quick e-mail. So is it possible to disable (hide) some menu items for smartphone users? Where can I do that?

Please advise,
Hetty

You can exclude menu items in your Mobile menu. Go to the "other" tab to find the text box. Enter all the menu id's separated by commas you want to exclude.

You can also download the mobile content plugin from here. Use the content plugin to wrap certain content you want shown or hidden on your pages.

thanks
Hetty