Okay, okay, okay. All you higher-ranking officers are right. I withdraw from further speculation.
I'm certainly aware that the
TMP script was in rough shape even during filming (with changes in story and screenplay credits along the way), possibly giving Nimoy an opportunity to make a contribution to scenes involving Spock's internal struggle. But the only place where I've seen this described is in Christopher Bennett's comments to a Tor.com blog post in 2013, summarizing material from the book about the
Phase II series:
Roddenberry managed to coax Livingston back to fix the script’s problems, though the two of them didn’t get along well and there was an extensive back-and-forth rewriting process between the two, with script input by Wise, Shatner, and Nimoy as well. The script was being constantly rewritten, sometimes up until just before scenes were shot. (The stuff with Spock weeping and getting philosophical about the search for meaning was largely written by Nimoy, I think.)
Maybe this is documented more substantially somewhere, but I don't recall Nimoy mentioning any
TMP script contributions in
I Am Spock. The very long and detailed Memory Alpha article about
TMP mentions Nimoy's (and Shatner's) script contribution to one scene unrelated to Spock's personal growth, but later quotes Nimoy as saying
We didn't feel that we were getting to play the characters that we enjoyed playing in the way that we knew how to play them.
These do not sound like the words of a man who got to contribute to how his character was depicted on screen.