TL:DR, read the SR5 Dev article.
I see, room for hacking peoples eyes, and fulfilling the various examples of combat hackery given in the fluff of SR4. But, honestly I always felt that was for the players to pull, and not so much to worry about. The NPCs are usually obligated to stay wireless, but also receive rudimentary training on rebooting their links, just like they get training on feeling for astral bodies passing through them. The idea though, that by somehow spanking your signal, or boosting it, or whatever "Crank it up" means, will somehow benefit you, other than making you a huge security risk is sheer fantasy though. A wired connection, by wire we mean fibre optic, is transferring data at the speed of light, with massive bandwidth. It's still linked to your pan, and your link is still connected to your corp's tacnet. It's a few complex actions to hack anything anyway, and by then the fight is over, the only time combat hacking would normally come in would be an extended combat or a preemptive strike. You're in a firefight and you hack the suppressing fire's PAN, shut down his optics eject his clip whatever. Not, I jump into the matrix and go limp in a pistol fight and hack the dudes pistol. Not even if they brought action phases into the order of a single second each would it really occur.
I don't think the current matrix rules are overcomplicated, but setting up the actions a hacker can take, to deal more damage in less time with more of a emphasis on brute forcing your enemies links in a firefight would help hackers in the fashion they're trying to make. The programs are already doing the heavy lifting for the hacker, make it so that he can take load up some macros and use them in a couple simple actions to smash a weak firewall (or a strong one if the hacker fine tuned his programs) and immediately start searching for the guy's ware, or gun, or whatever the hacker programmed it to look for, then another to just fire off a scrambling attack. Make it so cyberware is less safe, make it so, the hacker can royally jones your cyber eye's firmware in just a couple simple actions, without having to go ragdoll. Make it so, even if you're wired in, and skin-linked the hacker can with a little finesse bypass your wifi switches' safety catch, or just as quickly exploit the door you're taking cover behind to block you off.
I think it should be, if you wanna protect yourself from hackers, you get yourself ICs, and have your hacker watch your back. Because even if you're careful, the hacker should have some method of going through a backdoor you didn't think about, if he is clever.