How change the outcome after conversion ?

I have, say, two titles, T1 and T2, both of the same author "Aut". When I convert those titles from epub to mobi I get (after the conversion) one folder named 'Aut' containing two folders, 'T1' and 'T2*; both of those folders contain 4 files (e.g. for the first one: "cover.jpg","T1.epub","T1.mobi","metadata.opf" ).

Instead of all this I just want an output consisting of one folder named "Aut" containing 4 files, namely "T1.epub","T1.mobi","T2.epub",T2.mobi"), nothing more. Is that possible ?
Cheers
Mol39