Checklist

• I have searched the issue tracker for open issues that relate to the same feature, before opening a new one.
• This issue only relates to a single feature. I will open new issues for any other features.

Is your feature request related to a problem?

The (upcoming) v3.5.0 release adds support for dropping file and folders onto the window but there is currently no way to use custom codes for the send.

Describe the solution you'd like to see.

We need to think of a good way to make it possible to specify using custom codes when dropping files. How to expose that is a good question.