All,
Ive committed an update to flight_plan.dtd that adds support for specifying an altitude in both the oval and eight blocks. I could not think of a reason why you shouldnt be able to specify the altitude, nor why the code wouldnt support it. I did not add support for the survey_rectangle which appears to be the only other block type without "alt" support because I did not have time to test it.
for those you who need this simply do an svn up from the paparazzi3 directory.
AJ