Create a PowerQuery Folder function wizard
PowerQuery would be great if it was provided with the capability (current capability fixed) to import bulk XML and excel files. Currently excel is achievable with workarounds of creating a function for the folder function(why?) as in this post http://www.excelguru.ca/blog/2015/02/25/combine-multiple-excel-workbooks-in-power-query/ however it becomes even more obtuse (though) it shouldn't if you have an xml file representing more than 1 table.
Pressing import from Folder should expect that you are doing just that and ask what file type, then load the first file to edit as desired and then execute against all files in folder.