http://www.ghisler.ch/board/viewtopic.php?t=97&p=3160#3160
I think, it may have been discussed before, but is there a (similar) way to change the 'Function Key Bar' F3 to F8

In the 'user-button bar' (on top of TC) you can use the command:
lst2mlt.exe /X:"your-txt-editor" /L:"%L"
In this way, you can open ALL the selected txt-files at once in your editor.
I miss this option very much in the F4-button.