I hate the Delphi LCS because it wasn't a great design in the first place and wasn't intended to be serviced, so I'd prefer to get rid of it. Some of the dual 2.5s had a Panasonic LCS and they were much better, but I didn't have any of those to swap over. Even if I did I doubt I would have done so because that system will still ultimately need maintenance that may not go well.
Here's what I did with my dual 2.7:
I disassembled the heatsink assemblies from a couple bad 2.0 processor modules and attached them to the 2.7 modules. I reinstalled the new air-cooled 2.7 modules and also a bodged LCS cooling pump. Why the cooling pump? Diagnostics and thermal recalibration fail on these if the LCS pump isn't running. So what I did was create a loop with the old hose, fill the pump with water, and set it out of the way as much as possible during testing. Once the pump's electrical connector was attached and the air deflector installed, I booted the Apple diagnostic disc and ran the basic suite of logic board tests to make sure everything relevant was properly recognized. Then I ran thermal calibration, which passed. After that, I shut it down, disconnected and removed the LCS pump, and closed up the case. It rebooted in OS X and has been running fine since. The fans rev up more frequently and a bit louder than they used to, but CPU temperatures are kept reasonable and there are no system errors or crashes like it used to have with the old LCS. Under normal use the computer does not miss the LCS pump.
I had considered doing the same with the Quad G5, but unfortunately the 970MP runs much hotter than the 970FX so it's not a great idea. Also the air heatsink for the single dual-core 2.0 and 2.3 modules is much larger than that of the old single-core modules, so it's not possible to fit two of them in the same case. So eventually I'll have to rebuild the Quad's LCS.