Oh I thought you meant for the DC version of Quake 3. I was going to say that more in depth modding would need source code to be really possible.
I just looked up the PC specs for that game.
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In order to be able to run Return to Castle Wolfenstein at a minimum standard for the game, you will need a CPU ranked better than Pentium® II 400 Mhz processor or Athlon® processor, more than 128 MB RAM, a GPU that is better ranked than 3-D Hardware Accelerator (with 16MB VRAM with full OpenGL ® support), while the PC system is running on English version of Windows® 95 OSR2/98/ME/NT4.0 (SP6)/2000/XP Operating System.
While that does need better specs it might be possible to optimize for the DC. Since you are able to run the game closer to the metal, but the ram might be the issue. DC runs at 200mhz, so like said less overhead on the console maybe helpful but not impossible. To really get the most out of it one would need to develop a port with official katana SDK. I think maybe then with a dedicated group of people maybe possible. Maybe with the PS2 port's assets it would be able to run better with the DC's limited memory?