Fileuplode - rename new files if already exist + creating thumbnails on the fly

MODX Revolution 2.2.0-pl2 (traditional)

I've successfuly set up and used fileupload 1.0.1 for uploading image files from the front end. It all works fine but I would like the facility to be able to rename a new file if it already exists on the server. I looked at the snippet code to see if there was anything straight forward I could modify but I'm reluctant to do this blind.

I would also like to be able to create a thumbnail of the image file on the fly.

Is there a straightforward way to do either of these things

Thank you very much

UPDATE

I've installed PHPThumbof and sorted what I need to with thumbnails

Just need to sort the renaming of duplicate files 8-0

I've had a play with the upload snippet and added this code,
//Handle the uploaded file
$uploadfile = $path.basename($_FILES['userfile']['name'][$i]);
$nametemp = pathinfo($uploadfile);
$justname = $nametemp['filename'];
$justname .= time();
$extemp = pathinfo($uploadfile);
$repex = $extemp['extension'];
$uploadfile = $path.$justname.'.'.$repex;

It works but I'm sure there must be a "nicer" solution. Any suggestions?

:-)