Hi Michael,
Thanks for the feedback and confirming the SAPUI5 version is 1.12.7. That looks like a clever and practical use of your Rapid Prototyping Add-on you recently posted. Hopefully Design Studio 1.3 (or even better the next SP release of Design Studio 1.2) will include a more recent version of SAPUI5 (since we are now upto V 1.16) so we can take advantage of the latest features and fixes.
As for accessing the SAPUI5 libraries from the Design Studio SDK, this was touched upon during the Beta Program, where it was indicated we could use SAPUI5 controls by mapping directly to the corresponding SAPUI5 APIs, which is fine. However, there was no mention of which libraries within SAPUI5 are accessible and whether any special setup is required to do so.
Perhaps a member of the Design Studio Team could clarify this for us?