You could always use perl to write the batch file for AT.

open (BAT, ">setup.bat") || die $!;
for (my $i = 2; $i <= 24; $i += 2) {
   print BAT "at $i:00 /every M T W Th F S Su somejob.bat\r\n";
}
[download]

then just execute setup.bat!

Lighthearted tone aside, I have used perl to generate everything from batch files to 3D Studio MAX scripts to perl modules.