Hi Jironin, thanks for the feedback!
I'm happy to say the Voxel Editor has been partially reworked for v0.5 (which will come later this year) and will include some of this additional functionality to make modelling easier. If you're interested, there are some details in these devlogs:
https://zeromatrix.itch.io/rpginabox/devlog/14703/development-update-as-of-11717
https://zeromatrix.itch.io/rpginabox/devlog/16032/development-update-as-of-11211...
I don't currently have copy/paste functionality or a line tool implemented in v0.5, but they are great ideas and features I'd like to add!
In regards to the Script Editor, the functionality you mentioned does all exist already to some extent. :) Variable data can be stored in properties (either global or tied to an entity like the player or an NPC). Eventually I'll be adding support for local script variables for temporary/throwaway type values only needed within a script.
Weather effects are not available yet, but they are in the roadmap to implement later on.
Thanks again for the suggestions, I'm always happy to hear ideas and feedback so I can make the software better! :)