It isn't as simple as "Setting an address to a value". AFAIK You can't use CE to end the round. If you saw how I posed how to use it....Well you can't really do that with CE.
You need to add the magic number to a string:
sprintf(someCharBuffer, "mr %d -1 endround;", *(int*)0xFF5058);
And send it to a command processor:
processCode(0, someCharBuffer);
This can't be done on CE or using some address table..