I prefer playing carry without Stark's Fervor everyting other is good same as guide nice one +1!Keep it on :D

1. I have the point in rapid fire just in case. Who knows when you really HAVE to activate it to finish off someone? It's rare, but it's possible.
2. As I said, the attack speed helps build towards your next items. If you get a Doran's Blade, it MIGHT help you for a bit IMO, but the survivability of it isn't as great. 100 hp can be gone very quickly and without regen, it's a greater risk.
3. Flash is not quite needed because you shouldn't even be getting that far in, especially in team battles. And exhaust has almost the exact REVERSE effect. It slows the user down enough so that you can escape, for the most part.
4. True, but I believe that only applies for ganks. But even if you want to gank, you spend more time in the river than most champions and every little piece of time matters.
And I do not initiate a gank with Rocket Jump unless I know I can get them.

Thanks for your post! Appreciate it.

I play Tristana myself and had some questions for you to consider

1. Do you find yourself actually using Rapid Fire as early as level 4? Or would you rather have that point in Rocket Jump because you are initiating attacks more?
2. Doran's Blade = 100 hp boost + Damage boost. Health pot = 200 hp heal. If you're simply last hitting in the early game, do you find that attack speed boost useful?
3. No flash? Even with Rocket Jump and Buster Shot to flee from enemies, Flash is still extrememly useful.
4. Although Tristana is slow, isn't her lack of speed compensated with her surprise initiate from Rocket Jump, allowing for easier ganks?

I ask you these because you may play a different play-style than I do, which is fine.