The entire point of the dialog being timed is that it is a series of flowing conversations, a lot of them without the player being in control of the situation, and of course to add a sense of urgency. Once again, the most tense segment of the game is for me the conversation with Marburg in Rome. Damn.
Luisfius: My favorite is how to deal with Marburg, if you have a defined style already, but go all James Bond smug/sarcastic on him he will CALL YOU OUT, realizing that you are trying to get on his nerves (And to be fair, Mike's profile in the Graybox says that that is pretty much why he was recruited, because he can manipulate people very easily), but if your general style until Rome is pretty much pure suave, at the end he will actually get royally pissed and attack you to the death, instead of running away.
lowyhong: I managed to do both at the museum. Fighting him was just too frustrating (played on the hardest difficulty; I underestimated the game). The first time I just kept taunting him until he got angry and wanted to fight till the end. Second time, I wondered what would happen if I chose Debate, so I did, and he ran away. I didn't mind though, I certainly didn't want to fight him again. I must have gone through that fight about 10 times, and it was doubly difficult because I didn't put any points into Technical Aptitude.
Luisfius: Also, the sheer amount of variation and connections, it is possible to get Parker to attack Marburg as well. AND MARBURG AGAINST PARKER.
lowyhong: I read about that. You need to have Madison killed right?
You need to have Madison killed and find out she is related to him. He will flip out, and Marburg being Marburg, he will murder the shit out of him.
On the other hand, getting Marburg and Parker's full dossiers leads you to realize just what happened to him, what Deus Vult was, and who was responsible of betraying Marburg. Shit. Now I want to play it again, haha.