Please add ist at least to your roadmap! This would help a lot.
Apple Script saves users a lot of work, and some things just won’t work on a Mac without it. I think it would also save you - the creators of this wonderful client - a lot of work in the long run by empowering users to create and share their own solutions.
For example:
My invoice software GrandTotal sends emails with attachments through an email client, but not through eM Client because it lacks basic Apple Script support.
Other users too:
…
There are more but I don’t want to invest more time and make this post maybe too long
Dear fellow users, I suggest posting in this thread to keep it up and vote this up 
as well as Hookmark integration / AppleScript support | Mail | eM Client
It seems I am not the only one who needs Apple Script support for eM Client.
There was an attempt here Apple Script Support (eM Client for macOS) but I think it really should be in category Feature requests and I can’t move it there. So I started this thread