I mentioned this treaty in another comment, but are the advantages of the E-2 similar in nature for non-Americans to the those afforded to Americans by the DAFT[1]? Is the E-2 only applicable for citizens of countries that have a specific treaty in place?
The US E-2 is similar to the (into Netherlands) DAFT, except for the fact that the US doesn't allow for the 'sole entrepreneur' option : You need to fund a business with the plan to employ Americans.
[1] http://en.wikipedia.org/wiki/DAFT_(treaty)