Read the UC Score formula below. That is the starting point for the any UC admission and it does include the SAT II's. Each individual school department may or may not have addition requirements. It doesn't matter whether the SAT II's are useless or not, they are still required at this point so I hope this helps Trojanman.
"UC Score Total
The University calculates your UC Score Total as follows:
If you took the SAT Reasoning Test: The University converts your highest scores in critical reading, math and writing from a single sitting and two SAT Subject Tests from different subject areas to equivalent UC Scores (see translation table below). Then all five UC Scores are added together to produce your UC Score Total (critical reading + math + writing + subject test 1 + subject test 2).
If you took the ACT plus its Writing exam: The University takes your highest math, reading, science and combined English/writing score from a single sitting and converts them to equivalent UC scores (see the translation table at right). To give the ACT writing component equal weight to the SAT writing exam, the University multiplies the sum of your converted math, reading and science scores by two-thirds, then adds the converted English/writing score. This subtotal is then added to your two highest SAT Subject Test scores from two different subject areas, which are also converted to equivalent UC Scores, to reach your UC Score Total ([math + reading + science] x 0.667 + English/writing + subject test 1 + subject test 2)."
http://www.universityofcalifornia.ed...ship_reqs.html
From UC Pathways--as you can see, the Subject Tests are used in the formula to see if you are qualified for admission to the UC System. UC Pathways has a wealth of information if you have not used it already and it is also the cite to access the UC app. Private schools may use the SAT II's differently so check each individual school requirements.