Thank you for your post and for the details of your workflow which are related to the current feature request.
May I please clarify with you what exactly is necessary for you from managed packages? Do you use the interfaces for global classes or you are interested in sObjects? If your goal is sObjects, can you please tell me if they are important for you for suggestions in Apex files or you work on editing their xml files?
The reason for my questions is that right now we are starting our work on declarative development inside The Welkin Suite IDE, and the work with objects is our main direction in a frame of this extension of the IDE functionality. We are going to implement all the missed and required options in near future. The further part of the work will include getting an access to manage package objects. In addition, this will help us to solve the issue when objects are absent in the Code Completion suggestions.
As for your trial license, we will keep this in our mind. In general, we have some ideas and visions about extending or refresh of trial licenses. Currently, we discuss this to find the best opportunity for our users to use the test period for The Welkin Suite IDE.