I came up with a good way to have individuals outside of group not only help the main group, but not kill steal either. This is great for Powerleveling. This is also assuming you have the name class plugin (i.e. MQ2BERZERKER, etc)
Step 1:
Have the toons outside of group pop a merc (usually a healer merc), so they are now thier own mini group. or you can just have 2 toons in their own group.
Set the leader of that mini group to Maintank/mainassist/puller. This toon will be like the main liaison to the PL'ing group.
Set all other toons (if any) to assist mode.
Set that toons pull radius to "60". You don't want them going out and pulling their own mobs. They will attack only mobs that are pulled by the main group back to the camp.
Step 2:
Create a hot key that tells the "puller/tank" from the assisting group to assist the main tank of the group. Then engages. For my "out" group, I use a Mage for the maintank/assist/puller.
My hotkey macro looks like this:
Group 2 Assist
Line 1: /dex offgrouppullertoonname /assist Maingrouptankname
Line 2: /dex offgrouppullertoonname /pet attack
*Note: if have more than one group outside of main group helping, just add a line 3 and 4 to the same hotkey
Step 3:
Go grab something and bring to camp!
Once you pull something with the main group and bring it back to camp, hit your hotkey telling the other group to assist and attack. In my case, the mage sends in the pet. once agro is achieved, the mage engages. All exp goes to the main group provided they didn't get out DPS'd.
RINSE, LATHER, REPEAT
On a side note, typically, the main pull ends up bringing multiple mobs back to the camp. after the first one is dead, the outside group will just go down the line killing mobs in the extended target window. If only 2 mobs are on the agro list, both groups will always be on the same mob. If 3 or more mobs come to camp, there is a chance the outside groups are on a different mob after the initial one dies. just watch the extended target window to see if any mobs after the first one are getting damaged to ensure both groups are on the same mobs. This basically guarantees that all exp goes to the PL group.
A long winded post, but I hope this helps some people out.
@Sic is way better at this stuff and i'm not a programmer by trade or know how to do all that fancy INI stuff, but it works for me and wanted to share with you all in the hopes that this helps someone
