When sorting by label, numbers are sorted alphabetically instead of typical "smart" algorithms used for this type of field.
Reference usage: http://www.sevenforums.com/tutorials/88153-numerical-sorting-windows-explorer-enable-disable.html
This causes bulk addresses or those that are simply labeled with numbers to not be sorted in the logical order. A typical sort order we might see:
address10 address100 address1000 address1001 address101 address1010 address102 ...
Frustrating to pay with addresses 1-200 in this example...
Further feature requests for annoyances:
A range of payments cannot be selected using typical UI conventions. We expect "select first" -> "shift + select last" to select a range, and then spacebar to mark, but this does not work, necessitating hundreds of clicks.
Also "List mode" should be the coin control default, tree mode only makes sense for reused addresses which should be discouraged, and tree mode doesn't show or allow sorting by confirmations or date.
Bitcoin-Qt 0.9.3 release Windows x64/Windows 7