I'm new to the game but can you access your henchmen's inventory like with the Baldur's Gate Series?

In the NWN OC not in SoU you can.

Theres a hakpak at the NWN vault that allows cludgy henchman inventory control in the original campaign, as well as some significant AI enhancements like automaticaly switching to melee weapons when engaged in melee.

That last AI enhancement you mentioned seem a very worthy mod. Have you a link and is it sorted in the expansion packs?

The SoU henchmen do seem to have improved AI, but I havent paid any attention to them (due to the structure of SoU, its quite easy to lose your henchman permanently. And I didnt pay any attention) so I dont know how much of an improvement it is.

The henchman hakpak I use is here:
http://nwvault.ign.com/Files/hakpack...21482987.shtml

It says it works with SoU installed, but I dont know if it will effect the SoU henchmen.

Okay thanks for your replies, one more question though; Can i have more than one companion? Cause i don't see myself fighting a dragon with just two people.

You can only have one henchman at a time, as well as one summon and one familiar/animal companion if those are available to you. Can can, on the other hand, buff your allies with both spells and potions.