I don't think that the 7 npcs mod exists - it'd have been very likely announced everywhere - but then, the original non-WeiDU Widescreen was available from rapidshare linked from a topic somewhere, so it's possible, even if doubtful, that 7 NPC is a similar hidden gem.
There was a 'Team of Eight' quest in CtB, but its name is just misguiding: it allows you to do a quest alongside other eight people (I think they work like familiars/summons/charmed enemies), it doesn't modify the NPC cap. From
http://www.spellholdstudios.net/ie/ctb (emphasis and ellipses mine):
QUOTE
The Company of Eight
- <...> Bigger, faster, and harder, join up with the Company as they take on the evil Cult of the Dragon.
<...>
- N.B. The Company of Eight does not change the maximum number of party members.