After doing some digging in Adobe engineering plans it looks like RTEs in Touch UIs is tentatively targeted to be released in 6.1 SP1 at the end of Q1 2016 (https://helpx.adobe.com/experience-manager/kb/aem61-available-hotfixes.html). The initial 6.1 release supports inline editing outside of dialogs so you may have to temporarily break up the dialogs and get creative with your solution until the desired functionality is released.
In the mean time...
Could you use multiple-inplace-editors:
https://docs.adobe.com/docs/en/aem/6-1/develop/components/multiple-inplace-editors.html
ACS has some quasi related functionality:
https://github.com/Adobe-Consulting-Services/acs-aem-commons/pull/546#issuecomment-147440670