-localWorkers is a parameter of the GWT compiler and defines how many permutations can be compiled in parallel. Since SuperDevMode only compiles a single permutation, decreasing -localWorkers doesn't really make sense because only one worker is used anyways.--
The class that creates all theses threads is very likely Java's WatchService which is used by SuperDevMode to watch your files for changes so it can recompile only what is needed. You can disable the usage of Java's WatchService for SuperDevMode by using -Dgwt.watchFileChanges=false. This will cause GWT to fallback to a full directory scan to figure out which files have been changed.
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