If you want patches Sins is tied to Impulse regardless. My version of Sins is the retail box one and patches can only be obtained via Impulse's automatic update system.
Outside of updates, you can completely ignore Impulse. You can launch games without it and it will not launch itself to run in the background at the same time like Steam insists on doing. Nor are you required to go into a special mode to play without an internet connection.
NB: This information is good for the basic Sins game. Don't know if it's been changed with any of the expansions or the trinity version.
Frogbeastegg's Guide to Total War: Shogun II. Please note that the guide is not up-to-date for the latest patch.
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