Just to let every one know in case anyone is interested I have found a way to play several custom PWADS with doom for the psp. for those of you who dont know, a PWAD is a patch wad that is basicaly user created levels made by the people in the doom comunity, many of wich surpass the original doom/doom 2 levels in both detail and gameplay.
Anyway here is how you do it. using a program called WinTex, wich I was going to attach the file of but it is 281 kb so it wouldnt let me. if there is a way to override that or I can email the attachment to someone else who can post it, like a premium member or something. anyway using it you can combine two wads into one and if you join a PWAD with the original DOOM2.WAD and then put that file in the Wad folder in the doom directory and load it up it will be the custom levels.
I have tried a couple of different pwads but not all, basically if the wad does not use any special source port features like those used in ZDOOM (slopes, bridges, custom monsters/weapons, scripting) it should run.
The pwads I have tried (but not fully tested all the way through) are Hell Revealed 1 and 2 and Scythe. others that I havent tried but should work are Alien Vendetta, Momento Mori 1,2 and Moredeath
if anyone has any further questions feel free to ask and if anyone else can confirm any additional pwads working feel free to post them here.
some problems with using this method are if you try to load up a save file from normal doom it will crash the program so if you are saving and loading just remember wich ones are wich since you cant name the saves.
almost all pwads can be found at www.doomworld.com under the levels link on the right in case you are wondering.