UMD GEN è un programma, simile a VCDRomX, che permette di creare immagini ISO semplicemente facendo un drag&drop di file all'interno della sua interfaccia.
Come prima release permette anche l'esecuzione di filelist per ricomporre ISO già esistenti rippandolo...in futuro l'autore ha assicurato che altre interessantissime feature verranno implementate come il relinking di alcuni file e cartelle allo scopo di diminuire la dimensione su disco.
Trovate l'estratto del readme di seguito mentre come al solito trovate il programma in allegato:

UMD GEN v1.00

Create "Universal Media Disc" compliant ISO images.

Tool notes:
On launch ISO size starts at 0.04MB - this is size of the UMD Header.
In Volume View all field entries are locked with CAPS - this is the
UMD TOC Standard. Any/All of these fields can be left blank. If the
'Volume Label' remains blank the default UMD Standard label will be
used ('NA').

Importing a filelist will automatically sort all files in their correct
order - this does not include correcting the lba positions. Retail
UMD disks use extra padding between files which isn't needed for ISO
images not destined for UMD Discs. In Directory View, the Delete key
on your computer will remove selected files from the UMD compilation.

In Layout View you have the capability of moving any file to a different
LBA location, *Please note - Using the 'Move To..' option (right-click
on a file) you can only move the LBA position to a higher value than
it's original location - use the drag and drop method to move files to
a lower LBA position.

Export IML/IMS file - Any of the current free IML2ISO utils will work
to rebuild the ISO. UMD Gen does not export the full path of files -
only the 'virtual path' so the IML/IMS file should be used in the root
folder of the game when rebuilding.

Be sure to check www.UMDGEN.com for any updates and related PSP tools!

Sito Ufficiale: http://www.umdgen.com