If I'm Jerry I sign OLB Dan Bazuin and put him on IR. Do the same w/OL Charles Spencer.
Then lure/coerce/beg Larry Allen to come out of retirement to play half a season. The LG spot needs to be upgraded. Plus LA would be the enforcer on the OL, kicking Flo's butt back in line.
Finally free up 3 more spots on the roster. Like Bill always says, gotta keep churning the bottom of the roster, especially in times like these. Put Watkins on IR, cut Justin Rogers and Joe Berger.
Sign Ty Law (play corner or FS, or even just on nickel/dime packages). Even if he is not a significant upgrade to Jenkins, he brings a championship mentality to the D. He has been there, done that (even more recently and more often than LA). Even w/a lost step or three, he is still smarter, more savvy than ANYONE currently in the secondary_that includes every dang secondary coach from Maxie, to Campo, to frikkin Stewart. He can be the TRUE coach on the field.
With the last 2 available roster spots, go find some big fast physical hitters/blockers from other teams' PS who can improve the ST. I really like the Eagles' PS rook OLB Andy Studebaker (6'3 255 4.5) for one spot. Jim Johnson coverted the prolific small school pass rusher into a SAM LB and he was sparkling on STs in the preseason. The second spot would go towards bringing in a FB, preferrably one bigger than Deon Anderson (I'm leaning towards TE/H-Back Kolo Kapanui who is 6'4 270 and runs a 4.6).