I am inclined to do this as ID has not released the reg 1.5 patch. 
 (John Romero romero@idcube.idsoftware.com YOUR old and your slow!!!!!)

 Being that I am not only a DOOM GOD but a C programming god. I 
 will let you experiment with this wad. It will allow file loading and
 negative frags for 1.5 doom.exe and the reg 1.2 wad. By only loading 
 this file it will add those things that are in the 1.5 shareware
 wad into the REG 1.2 WAD that will allow you to run deathmatch
 using neg frags. 
 so to load a file put "doom -file 151.wad your.wad"

 PS I put the dmxgus.ini file from 1.5 shareware 
                   
 With the addition of the fix.bat that I have included you may even
 get deathmatch 2.0 working. REMEMBER copy your doom.wad from reg 
 version 1.2 into the dir where the 1.5 doom.exe is located. Run
 fix.bat to replace the ifoga0 -ifoge0 ppms. These make the regeneration
 graphics for the objects. Then hexedit using pctools the name
 BAL3A0 to IFOGA0
 BAL3B0 to IFOGB0
 BAL3C0 to IFOGC0
 BAL3D0 to IFOGD0
 BALDE0 to IFOGE0


   Ok my first posting on recycling the doom 12 reg wad would only 
allow single player file loading. 
 
 This pwad will allow the use of the 12 wad and deathmatch 
with the negative frags. Deathmatch 2.0 is also possible. 
 
 I been playing the deathmatch with neg frags and it seems to work.
I recorded a lmp in ledges.wad with altdeath enabled 
just run VIEWLMP.BAT to see after you do all the above.
        
   You ask yourself how I did this? You as yourself am I the DOOM GOD. 
You ask yourself do I have a GOD complex. Again I am GOD, Doom GOD   

Well lets say since I TA a high level CPSC C programming course and 
suffice to say I am Excellent as well the source code is available for DEU.


PS. Romero didn't play me I alloted june 18 or 19th and he didn't play me
so I let for vacation. I am telneting to my account.


Eric "Pook-Gai" Leung. July 14th version one of hack. 
Email me for help eyleung@unixg.ubc.ca