By George, you have the Becker spirit! Simple, straightforward and hard working.
No, 440c isn't a whiz-bang super steel, and some folks look down their noses at it for just that reason. I, on the other hand, am a firm believer in the old adage of "If it ain't broke, don't fix it," and 440C certainly isn't broken. There's a reason that it's been a popular steel for so many years: it works, and it works well. It takes a good edge, holds it relatively well, and it really is highly rust resistant.
I have an old Buck 112 in 440C that's still going strong, that's still razor sharp, after about 40 years.
What steel would actually be used wouldn't be up to me, but 440C is what I had in mind. There are other, newer steels available that might be better I don't know, I'm not a metallurgist but I had 440C in mind because it has a number of factors that make it a good choice for this kind of folder.
Other thoughts? I'd be interested.
Although the handles on the Retribution are nice, I don't think the handles on the Becker folder are really similar at all. I designed the Becker folder to have a "folderized" version of the traditional Becker handles, handles that have been in production for over twenty-five years.
As far as putting an opening hole in the blade (that was what you were talking about, right?), it already has a thumb stud for opening. Personally, I like thumb-studs better than I like holes. Thumb-studs can be more easily operated when wearing gloves than a hole can, and since this was designed to be a hard use knife where many people might be wearing gloves for various reasons the thumb stud makes more sense to me.
A final decision on that kind of thing would be up to Ethan and KA-BAR in any event. I can design 'em, but it's not up to me whether they get produced or not.
Well they should make one. I would love to have one. I wonder if KA-BAR doesn't do it to not interfere with the other folders that they make for their own name.