UPDATE: B1UP 2016.08 and higher support this scenario
This is a known limitation. SAP currently does not support that feature through the SDK
Your wish have been turned into a feature Request that you can see/vote for here:
https://support.boyum-it.com/hc/communities/public/questions/204117156-IPT-Make-it-possible-to-have-golden-arrows-and-Choose-From-List-on-a-field-that-is-bound-to-an-UDO-when-moved-on-to-the-main-screen