Regarding the "gap at the bottom" - currently I can not suggest a suitable workaround for removing this issue. The good news is that our developers are working on the implementation of new rendering for the buttons in Kendo UI Mobile, which I believe will fit in your case - this improvement will be available soon.
As for the second issue - we had a similar problem which was fixed in the Kendo UI v.2012.2.710. Please make sure you are using the latest version of the product. Also, I think you may find this article
useful - it serves information about form elements added to a mobile View.
the Telerik team
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