While it's not a huge boost to regens if you're already maximizing recharge, at least it is a clear benifit. I don't see any other scrapper secondaries benifiting dramatically from the alpha slot. Inherent fitness helps improve mitigation a lot more then the alpha slot does in most builds I've looked at.
Yeah, I think inherent fitness is probably doing as much as the alpha slot on most of my characters. Werner (Katana/Regen) is going to benefit tremendously from both, and from the fact that he's still running an I12-I13 build so has a lot of possible IO and power choice upgrades. But most of my attention has actually been going to Alexei (Katana/Dark). He recovers from the IO nerfs/fixes and gets solidly better DPS and survivability. Nothing dramatic, like you said, but nothing to sneer at either.
"That's because Werner can't do maths." - BunnyAnomaly
"Four hours in, and I was no longer making mistakes, no longer detoggling. I was a machine." - Werner
Videos of Other Stupid Scrapper Tricks