Looking for Help Setting Up Middle-Mouse Button to Delete Selected Items

Delete on its own is better than Delete {allfile$}, since it applies to the selection by default automatically.

The main issue here is that the double-click events inherently only apply to the file that was double-clicked, not to all files.

You can override that with a small script:

@language jscript
function OnClick(clickData)
{
	var cmd = clickData.func.command;
	cmd.deselect = false;
	cmd.ClearFiles();
	cmd.AddFiles(clickData.func.sourcetab.selected);
	cmd.RunCommand("Delete");
}
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