I agree with Voydangel, best I can interpret, no, you don't stack the "I punch/kick/head-butt" damage with the "I attack with shock-gloves" damage or the "I brush them with shock frills" damage.
Grabbing someone with a shock-glove is not the same thing as karate-chopping them. And if you DID want to apply that Str/2+3P through the fragile electronics of a shock glove, I'd probably say "bye-bye glove".
Think of it as using different techniques, you aren't bringing your full strength to bear (or else they'd include strength in the damage for a shock glove to begin with), you're pressing a shock-pad to them.
If you don't like that common-sense explanation, the other perspective is they're three different weapons (shock glove, shock frills and head-butt) with three different damage values. You have to choose which one you're using.
All that being said, nothing explicitly states this in the book, other than the damage codes (5S(e) for shock gloves, Str/2+3P for titanium punching). Therefore, your GM could say that when you hit someone with shock-gloves or frills, you can follow through with the full force (Str/2+3P) on top of that in a single throw. But, don't try that at my table.
Related, but side note: there is no damage notation for shock frills and the pricing is not put in terms of "cost x Rating", though Armor Modifications specifically states that everything except chemical seal is rated 1 - 6. Should probably be brought up in the errata forum. I suppose they could argue that you use your unarmed combat damage (in this case, Str/2 + 3P) since the description says you use unarmed Combat. However, that contradicts the "rating from 1 to 6" in the description above. All of this is on page 327 of SR4A, btw.
EDIT: Posted the question about Shock Frills DV in the errata forum. GM Gods help me if I stupidly overlooked something obvious.