Editing multiple files with F4

Hello, when I select multiple files in winscp 3.7.6 and hit F4, only one txt file will open in my external editor (pspad 4.5.0). I have to do the F4 trick multiple times, if I wan't to open 10 files and it's pretty tardy. Is there any way winscp can open these files with only one command???

This is supported since version 3.8 beta.

Thank you!