Windows Disk Defragmenter also does not (from memory the last time I used it - years ago) let you choose where things go.
I've never used any defrag software that lets an end-user place files exactly where he/she wants them to go - sure there are those which will reorganise a drive putting system files first, big bloated files last, etc., at the expense of the defrag taking forever and possibly prematurely damaging/wearing out the drives because most of the drive contents would have to be moved about.
Having the ability to let someone specifically place a particular file into a certain sector/sector range would to me be too much messing about with a defrag tool that would most likely already have better defrag algorithms than I could ever randomly think of.