Ah, some of the classic questions.
Indeed...but not always easy to answer.
This is where "common sense" falls by the wayside because either everyone has a different idea of what maks sense, or the rules themselves go against it.
I think double-jointed gives you the bonus as long as you have one arm with it.
But what if you have two?
Thick. Myomers take an option for Corvettes. Standard cyebrleg options. Corvette system does not take a space.
This is how I usually treat it for the sake of balance (after all, price-wise, basic corvettes cost the same as a pair of legs with thickened myomers, have lower HC AND offer the speed bonus. Advanced are only a little more. You;re getting such a huge deal that giving up an extra option spot makes sense)
BUT it could be argued that since it says 'both systems *incorporate* the thickened myomer limb options' that the thick mayo (as my group calls it) is part of the corvette system and thus does not take any options. After all, these boosted leg muscles are a big part of how the legs make you run faster. That's not how I handle it, but I've seen people rule it that way and it makes a degree of sense.
meanwhile, a lot of Reffs throw out Corvettes, Speeding Bullets and Skate Feet entirely because of how they all make Ma completely pointless and don;t cost all that much (especially skate feet)
Feet and hands take an options slot, yes. Page 89, MRB. Happily and frequently tossed out by Refs, but that's the base ruling. Which was fine by me. Reason? Second set of limbs doesn't have hands - just guns in that slot. Or whatever.
And yet if I had a second set of limbs installed I would always give them hands. Why? Because you can still HOLD a gun, but also do everythign else in the world.
But yeah, that is the RAW, but it's something most reffs throw out.
The games I've played, the Reffs have always ruled instead that the hand itself is its own thing. A basic hand comes free with your cyberarm, but you get one hand option space to either incofporate into it or replace entirely (which includes all the various hand availble, plus some cyberweapons and certain specific options t reff's discretion), and/or 5 finger options. We say and/or because many hand options include finger mounted weapons or tools. You could give yoruself quick-change fingers though, that way if you had, say, a Ripper hand, or a Tool Hand, you could buy five quick-change sockets and then be able to replce your ripper blades or finger tools for other cyberfinger options.
One player was so into cyber-fingers that he carried a bandolier of interchangeable digits. The Reff had to come up with his own rules for the HC involved though.
Coverings are listed under options and would cost a slot. Gleefully thrown out for being dumb.
It seems to be ignored by the game itself even. As I said, full borgs have one less option slot than normal per limb...which probably accounts for their normal hands and feet...which means the total body plating they have doesn't take any limb slots
In fact, just to go back to the Eclipse, it has 1 free slot in each leg...and yet it has the following already installed: Armor plating (with included chameleon system), Secret compartments, AND a foot option, which is effectively 3 items per leg, but somehow it has a spare slot in addition.
You need at least one of stealth feet, grip feet, etc, unless specified otherwise. With one, you get the bonuses. With two, more bonuses. Having even one stealth or grip foot makes stealth/climbing easier.
I'm not so sure. Yes, having one foot that makes no noise is objectively quieter than having two feet made of solid metal...but is it enough quieter to really make a difference when, as stated, your other foot is made of solid metal?
you go from...
CLANK!
CLANK!
CLANK!
CLANK!
to...
CLANK!
.............
CLANK!
.............
That's quieter but is it enough to matter? If your other foot is still clanking about you;re still going to be heard.
If your other foot was made of meat and had a nice soft shoe on it then sure, you'd be better off.
Or I suppose you could imagine that since it;s being custom built for a high-end borg, each foot is a sort of stealth-climber hybrid. Not as good as pair of either but at least you've got two silent feet that can climb.
i'm not saying your answers aren;t good and valid, and in fact, I think the same way for the most part. just demonstrating that sometimes there's no easy answer.