Well, the really sad part there, is that you should not (have to) do that.
The unitpath "C:\FPC\3.0.0\units\$FPCTARGET\*" (notice the asterisk) searches your C:\FPC\3.0.0\units\i386-win32\ folder (when compiling for that target) and it automatically searches the subdirectories of that folder for you.
For me that one line is enough to be able to compile a projects that includes unit crt, ergo there must be something wrong with your setup/configuration.
Also note that you are able to 'export' the message list (saving it into a file) using the right mouse button (there are probably keyboard short-cuts as well but, i do not know them from memory).
Note that i did not made the remark in red in one of my previous post just for fun. When you have multiple FPC versions installed this automatically reverting to use the users appdata directory without telling the user is f*cking things up considerably.