You can do this in Condor 6.6, though it requires some extra work. You can have the execution machines include the environment variable values in their startd classads: http://www.cs.wisc.edu/condor/manual/v6.6.5/3_3Configuration.html#param:SubsysAttrs
Then, in your job ads, use the $$ notation to have the values substituted in the jobs' environment: http://www.cs.wisc.edu/condor/manual/v6.6.5/2_5Submitting_Job.html#SECTION00356100000000000000
cheers Mike Thon