Thanks for your suggestion.

This request is being tracked already:
https://winscp.net/tracker/194
You can vote for it there.

A previous FTP client I used processed Delete commands for remote files through the operation queue. This was really handy for being able to set up a sequence of file changes, replacements, etc in a certain order.

Currently in WinSCP, though, selecting the Delete command on a remote file deletes it immediately, regardless of other commands in the Queue.

Being able to schedule the Delete command via the Queue would offer more flexibility for remote file deletions.