You can use the Ant Shell indepentently of the AntFarm tree. The Ant shell provides the following commands:
! [prop=value]* -- runs the default target for the current build file with specified properties.
![target_name] [prop=value]* -- runs the specified target for the current build file with specified properties.
? -- lists the available build files and usage
=build_file_number -- changes the current build file to the number identified by "?"
+[full_path_to_file] -- load this build file into Ant Farm. Searches up the current buffer's directory tree for a "build.xml" file to load if a file is not specified. Re-loads the build file if it is already loaded.