Hello,
yes, I miss that panel too, and I made a request to have it added for ColdFire in the next MCU release.
For now you can add additional options in the
C/C++ Build > Settings > ColdFire Compiler > Language settings.
On the bottom of that pate there is 'Other flags' where you can add any additional flags. So to add your own defines add
-define MY_DEFINE=1
which would be equivalent to
#define MY_DEFINE 1
in the sources.
BK