I get the impression you're asking if you can load just the Adobe SiteCatalyst tag as a standalone file, without loading the main utag.js code at all. If that's what you mean, then no, it's not possible.
All the utag.x.js files interact with the main utag.js to form the complete solution, and it is the main utag.js that triggers both the send functions inside each of the tags, as well as the page view request. If you were to load just utag.1.js for example (assuming this is your SiteCatalyst tag), nothing would happen.
Might I ask what the reason is that you don't want to load utag.js on every page? Are you concerned about performance?
There is a feature that may be appealing to you called "bundling". This forces all tags that have an "All Pages" load rule to be included in the utag.js file, rather than being published into separate utag.x.js files, thus reducing the amount of individual requests made by the browser and slightly increasing overall performance. This option is available in the "Configure Publish Settings" option inside the save/publish dialogue box.
Hope this helps. Please do let us know what the exact problem is you are trying to solve, and perhaps we can come up with some other suggestions for you.
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