Since the LE versions are limited versions anyway, it only makes sense that they are limited in the number of FX that can be in a given project.
Cakewalk has increased the number of FX in the MC line. If I remember correctly, it used to be 8 total. That was increased to 24 in MC7. However, if you want more than that, simply get one of the Sonar versions and you are limited only by the power of your DAW's processor to run all those plugs in real time.
Or.... as has been suggested.... use a sub buss for the FX or use the AUDIO>PROCESS FX function.
Even though I have Sonar, and can run quite a few plugs, I tend to use a very limited number and also tend to put them into the sub busses.