Your conclusion sounds logical to me, but I think it does actually affect your captain's kits abilities. I seem to remember reading a dev post a while back that said that. I'll try to find the post(s) about them, but I might not be able to find them (it's been a while). My main computer died, so I can't really play STO on this one, so I've got time on my hands, heh.
So... I thought to test it. Here is what I found out:
I brought 2 boffs with Medical Tricoder II maxed at 9/9. I found a cliff and jumped off it with my boff waiting for me at the bottom. I repeated at least 10 times for each try. First 2 tests were done with each boff alone in the team.
First officer doesn't have any creative traits: He gave me 375 hp. The 375 makes sense because the tooltip says 355 and I have 7/9 Science Team leader.
Second officer has basic creative which is 2.5% extra dmg and healing. Gave 384 healing
I then brought both boffs together with me, enabled each med tricoder in turns. First gave 375 and second 384.
Conclusion: Creative does affect "kits" or officer abilities