I can understand the hesitation, but what do you have to lose; make a backup of your icd file and try the fix. If you do not like it, paste in your old icd file. However, I do know the pathfind increase does work and is not a failed attempt like when I posted the TA clone earlier. Now this actually modifies the icd file and not the shell exe. All I can say is I have seen this work on my games. I usually like to play on large maps and before the fix, my units would get stuck for a few seconds or longer on bridges, land bridges, sinkholes and other things in the game where the unit would have to figure it's way around but with the fix, I noticed the units would respond almost immediately to whatever obstacle(s) is in their path. As I have said before the downsize is that your game might lag if your computer cannot handle the load. However, the peeps at TAUniverse came up with 66650 cycles as being the magical number due to it not causing too much load on a system. In addition, the cycles can be much higher but if your system cannot handle 66650 cycles then maybe default cycles is best for your system; however, we can tweak the numbers to get a cyclic number that might be better for your system.
Btw, I have my cycles set to 120000 and my game does lag unless I turn off shading, anti-alias and bi-linear due to unit max set at 1500 and three AIs.