Intentionally crafting cursed items requires the same item creation feats and skill checks as does crafting a normal item of that type, but in addition to such requirements, intentionally cursed items require bestow curse or major curse as a spell prerequisites.
The effect you're after sounds like an item with an intermittent effect. While that's listed as a -30% cost, I don't think I'd allow that as a GM (unless you're a hoaxer bard), or I'd add to the cost for the bestow/major curse requirement.
It's not listed, no. If you're limited to listed intermittent options you might want it to not work when within 10' of a member of your race, and try to stay away from the suspect ally at most times.
The only thing that comes to mind is the Cult Master archetype for the Mesmerist class. Not entirely sure how the penalty suppression thing works without further reading, but I'm guessing you could choose to apply any penalties you might inflict via stare feats or whatever at your option.
You have to ask yourself this...why are you working with someone that you need to plan to protect yourself from. If this weren't a game you would simply stop associating with that person.
You should talk with the player in question about working amicably with the party and not fostering this level of inter-party conflict.
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You're basically looking to make custom magic items, so this falls entirely in your GM's domain. There probably aren't any official rules anywhere, as this option should logically drive the crafting cost up while reducing the sale value (even if it comes with a free frogurt)...
Keep in mind the Pandora's box you might be opening, however: If you can create 'safe' items like this, your opponents can as well, and maybe all their cool loot ceases to function (and loses all resale value) when you kill the current owners (flashback to every 'Well-equipped Drow attack your village' scenario ever)...
For a tenuous link to the crafting rules, maybe you could look into adding a command word ability to the item that casts Dispel Magic on the item itself or - for a crueler approach - Hold Person/Hideous Laughter/Detonate on the wearer.
It wouldn't be a cursed item as far as the rules go, though, so the wearer could still simply remove it.
it sounds to me like you don't want a Cursed item, you want an item only you know a locking Command Word to.
Some things to consider
1) you have to pay for it... this would be a GM added cost as no rule for it. I would add a % to the end cost.
2) Spellcraft can find out what the Command Word is. But if you are the one they go to for this, your good.
3) Use Magic Item Skill can still Activate Blindly.
Aside from the applications in the original poster's party, I could see this being a flavorful tool for GMs to put on their evil masterminds . . . .
Aside from the applications in the original poster's party, I could see this being a flavorful tool for GMs to put on their evil masterminds . . . .
....and I was thinking the same thing. Whenever a player of mine comes up with a clever/out-of-the-box idea I ask, "Are you ok with the bad guys doing it to you?"
I'm just going add my voice to the chorus, this is not a drawback. Depending on how you work it, this could be an added feature and cost more.
Sometimes, parts of your party may or may not be completely on your side, and at those times it may pay off having a contingency plans. Like having the magic weapons you crafted for said partymember stop working or some other cursed item effect.
Is this possible? Can you craft cursed items who's curse only appears after a certain phrase is spoken?
They wouldn't necessarily be cursed, but they would be customized from you, which means you'd need the GM's permission to create a failsafe to disable the magic in question.
Because based on what you want, you're looking at adding an Anti-Magic Field or similar effect that functions upon the crafted items when you speak the command word (a Standard Action to do, I might add), which means it requires high power to do.
Granted, you don't actually need the spell (can just increase the craft DC by 5), If I were GM, I'd actually hard-require that spell on your list since you're purposefully adding it as a generic override to the stuff you craft. I'd also suggest cheaper means of protecting yourself from your PCs turncoating and using your own creations against you; think Batman with individual plans to defeat every "superhero" that would turn rogue.
Or, I'd simply charge them 75% of Price for each item they request to discourage them from trying to munchkin off of your character choice that you took (mostly) for yourself. Even if they question why you're charging party members, just say it's for an insurance policy (which it actually is technically speaking).