Does anybody think it would be worth having the ability to output reports in .xls or .xlsx format as part of standard MRBS?
At the moment you can output reports in .csv format and these will be opened in most cases automatically by Excel. Having them in .xls or .xlsx format does help in some circumstances with opening and it also means that they are genuine spreadsheet file which enables MRBS to apply fancy formatting, eg freeze-panes, font styling, etc. The downside is that PHPExcel, the library I used for this in my own implementation, is huge (~ 20 Mbyte, much larger than the rest of MRBS). So I guess it would need quite a lot of support to justify putting it in.