Dips (in all forms) can hit that tie-in area for a lot of people. If your gym has a "V" type dipping bar, which allows an extra wide grip, than so much the better. Or if you can dip with the knuckles facing forward, elbows out, that tends to hit the focus area. Or trying doing a muscle-up/press up on a chinning bar. Check out some gymnast (those on the parallel bars or horse events for example) for that delt/pec blend. Might also try DB inclines, with the DB's held in a hammer grip and pressed closer to the body. Can use a BB too, with a closer grip. Consider the overhead military press, with a closer grip. Do a search for Gironda (might try T-nation.com..had a good article on his methods on "V" bar dipping) for that delt/pec tie-in)
Up-right rows can hit the traps and is an exceptional exercise for the laterial head. And to a lesser degree, the front delts and rear. Reverse Pec Decks for the posterior head as well as one arm DB rows with the elbows out wide and in line with the shoulders themselves. Might try doing laterial raises while lying on a incline bench, one side at a time. Can also lay on a mat, on your side, with a DB in front on you. Raise it up overhead and lower it behind your back. From the behind position, raise it up and lower back to the starting position. Alternate this way for 8-10 reps. As far as regular standing lateral raises go, I prefer the slight cheat version. The DB's are held in front of the body, and with a slight heave, raised to a little higher than ear lever. Good mass builder in my view The thumbs are pretty much facing downward at the top position. Good Luck.