I realize that the American Civil War could very well be considered total war (in which all of a nation's resources, civil and military, are geared toward the objective of winning the war), but what policies were enacted or lobbied for/against, that were unrelated to either the war or slavery?
In other words, what would Lincoln be known for if the Civil War had not occurred?
Well, it's impossible to know what kind of President Lincoln would have been without the ACW, as the event (or threat of it) informed the politics of the Republican Party's formation, the previous two Presidential nomination cycles, and the vast majority of Lincoln's presidency. We have an understanding of Lincoln's political leanings outside the abolition debate (classically Whig, trusting in the authority of Congress, a big fan of internal improvements like roadways and canals...Doris Kearns Goodwin's 'Team of Rivals' is a great source for this). But the ACW consumed so much of his attention during his Presidency, and rightly so, that Lincoln really is defined by the conflict and the politics surrounding it.
To answer your question directly, though, Lincoln's administration is responsible for the Homestead Act (1862, more here: https://www.loc.gov/rr/program/bib/ourdocs/Homestead.html#American), which gave citizens the opportunity to purchase literally millions of acres of land out "West" that had previously been held by the government. Lincoln also signed the first Income Tax into law, and gave birth to the transcontinental railroad with the Pacific Railways Act. Lincoln also created the Department of Agriculture, and signed the National Banking acts of 1863 and '64.
There are plenty of resources available to read about any of these acts or initiatives via the Library of Congress, but if you want analyze what they mean within the context of Lincoln as a President, Goodwin (cited above) is a great start. Just looking at the facts, between the strengthening of the federal government via the banking, income tax, and even agricultural initiatives, and the push to open up the American West to future settlement and exploration, I think a great picture of the man comes into focus. This was a guy who really believed in the promise of America as a concept, in the tenants of the Declaration of independence and the promise of the republic in its loftiest state. This was a President that wanted to simultaneously strengthen the core foundation of what the U.S. was while giving ordinary citizens the opportunity to succeed within that framework.