Thank you both. Problem is due to corporate security we can't edit any Registry settings or environment variables (even user environment variables). We'd have to go through corporate security to have that done and honestly it's just easier to launch Pl/Sql Developer from my own bat file with the set nls_lang in there first.

Marco - Is there any Login.sql or any script that Pl/Sql Dev utilizes where i could do the set nls_lang? I tried it with the Login.sql that lost mentioned but it didn't have any impact. Just curious since other tools are somehow either not using or override the system/oracle client level NLS_LANG. Was hoping Pl/Sql Developer had some equivalent.

Thanks,
Jason