Another useful tip is to use
%* to mean "all". For example:
echo off set arg1=%1 set arg2=%2 shift shift fake-command /u %arg1% /p %arg2% %*
When you run:
test-command admin password foo bar
the above batch file will run:
fake-command /u admin /p password admin password foo bar
I may have the syntax slightly wrong, but this is the general idea.