Can homeowners install sink grease traps to prevent build up in septic/sewer lines?
Don't dump grease down the drain. Discard it in the trash (or use it for further cooking.) Pour out grease/oil into a can for cooling, possible refrigeration and re-use, or to discard in trash. Wipe most remaining grease out of pots and pans on a paper towel and discard it, before washing.

Also, go with the recommendations of virtually every public health department and cooperative extension and stop wasting money on "bacteria additive" - none do any better than the ones in the waste stream naturally, and some have deleterious effects (they successfully "liquify wastes" and plug your drain field, when the whole point of the septic tank is to separate those solids so they can be pumped out.) A plugged drainfield is VERY expensive (you need a new drain field.)

You can install a small grease trap inside, but then you need to maintain it. Or you could install a large grease trap (pretty much like another septic tank) outside, ...but then you need to maintain it (in some places, there is a minimum pump schedule by law for grease traps.) Grease trap maintenance is decidedly gross - it smells terrible.

http://store.msuextension.org/publications/HomeHealthandFamily/MT199401HR.pdf

http://extension.psu.edu/natural-resources/water/septic-systems/septic-tank-pumping

http://spock.fcs.uga.edu/ext/pubs/html/C819-3.html

https://www.extension.purdue.edu/extmedia/ID/ID-142.html