I agree with the 1x1 cheese slope with a stud, with the inverse stud, the 1x1 plate with a longer stud and the 1x1 round tile...these are great for greebling!The longer stud would add more stability to connections to 1x1 bricks or anything of similar mould.
I would like to suggest the following:
Part 1
Part name: 1x1 round plate with double sided open studs
Part description: for connencting parts with small diameters (e.g. a lightsaber hilt to another part with a similar diameter, like the ones used for flick missiles<not the nose cone>)
Part usage: For producing longer parts or parts of desired length (i.e., not too long)
I was building a double turret using lightsaber hilts and nose cones but the part I wanted to connect it to has the same diameter as the ends of the hilt. If I used the technic pin from the flick missiles, it would make it would make it as long as the mounted cannon I was making.
A modification would be 1x1 round plate with an open stud(I really don't know if it's already made)
Part 2
Part name: 2x2 round brick with double sided axle hole
Part description: as above, that could fit an axle in the x and y axes
Part usage: For making connections to other parts using axle pins.I asked our local seller, he said there are no such parts.
Part 3
Part name: a spring loaded hinge brick
Part descrition: a hinge brick that has a twisted wire under tension that would allow it to spring out from it's original position but with the studs facing each other or away from each other, if the other connection has no studs, depending on the intended use.
Part usage: Imagine hidden cannons that would jump out from it's compartment once you remove the lock or holding mechanism (like a from a trap door)
Part 4
Part name:Cellular phone
Part descrition: as mentioned
Part usage: to partly keep up with the times!
I also wish they could make extra arms for the robot of the 8683 collectable minifigs.
I'm really not well versed with the existing LEGO parts, please feel free to point them out! THANKS!!!