You can include the RTE plugins in the Multifield Touch UI like you include in In-PlaceEditor: https://helpx.adobe.com/experience-manager/using/configure-touchui-rte.html
But issue is that, all the RTE plugins won't appear in dialog that contains Single/Multifield. Only default/limited RTE plugins will appear in the dialog.
See this community article which tells how to create custom RTE plugins in Touch UI: http://experience-aem.blogspot.in/2015/07/aem-61-touch-ui-composite-multifield-with-rich-text-editor...
This thread discusses the same: http://help-forums.adobe.com/content/adobeforums/en/experience-manager-forum/adobe-experience-manage...
All works for rte plugin in touch ui when rich text is not part of multifield. My issue is that richtext is part of multifield so in that case how to integerate the rte plugin for every richtext of multifield for touch ui
In the multi field i am able to add text for the first time. But when I try to edit the things for the first time after some content and click on add field then i am not able edit the previous fields. If you have the same issue, if have a fix for it please share content.xml for the multi field you created.