Hey Ken, way to necro a thead.

Standing gains are shared as one of the ways to get to higher level missions on new characters is to have them fleeted with a character running the high level missions and share the rewards. This gets you reputation with the agent, plus some with the corp.

However AFAIK it won't get you standing gains with any factions, those are only gained by doing the storyline missions and only the character who took the mission gets to count it against the '16 missions to get a storyline mission' number.

So in short multibox PVE mission running would probably be done best with one lead char and some supporting 'slaves' and _not_ sharing the reward.

That said, take a look at the new 'Incursion' PVE features:

http://www.eveonline.com/devblog.asp?a=blog&bid=819

This is specifically set up for small gang PVE so should be ideal for multiboxers at the lower end.