Hi Luke,
The semantics of "[p" actually mean "paste before and adjust indent automatically", the same way that "]p" means "paste *after* and adjust indent automatically". As rphan commented, the regular way of just pasting before is capital "P" (typed Shift-P).
The "]p" and "[p" commands were implemented and made available in ViEmu/VS and ViEmu/SQL 2.0.61, and officially in the last official release of both, 2.1. You can get links to download the latest versions from this forum post:
http://forums.ngedit.com/viewtopic.php?id=182
If you want to use it in ViEmu/Word & Outlook, it is also supported in the latest release, although there is no actual reindent behavior.
Let me know if I can help with anything else!
Best regards,
Jon