Thank you for the feedback. I'm working on the engine this weekend and will try to get some of those features added in. We welcome all contribution to the project. We have the full binaries available here for download (depending on your OS), we have the source code link as well (with steps of how to build from source). By the end of the day I should have the latest build though.
No you don't have to rebuild the whole project anytime you want to add something. The editor is just Javascript code, so even if you use the downloaded binary, the source is still visible in it (src folder). It's mostly there but I'm doing a bunch of QOL stuff at the moment before going to add more features.
For myself I am using the source version, and I open the app with the shell script to do live editing/testing of the editor. On windows it would be the .bat file.