That's because the K1 is an additive design: they did not design the camera as a whole, but they added up things on top of existing cameras designs, ending up in inconsistent design.
Originally posted by Cyril_K5 1. Why did they invert the LV and image preview button??
You have to get used to it, it's not a big deal, with repeated use over time, you get used to it, it becomes a reflex
Originally posted by Cyril_K5 2. I can't get the idea behind the new "quick access" dial on the right
I agree with that. It's something that was added but not designed together with the rest of the interface; Result is, some of the functions that are there do no require direct access, and other functions which would require direct access remained as they were on K3/K5. Also, the remaining lcd is small to the point that it displays nothing and they could have removed it completely. Anyway, it's there, it had weight and complexity, but not so much convenience at all. Typically designed from a conception of the mind rather than practical experience. Ok, I'll not use it, or perhaps only for ISO in manual mode, that's all (a single wheel would have been sufficient then).
Originally posted by Cyril_K5 3. Why is the focus selection button so small and so inaccessible?
This one pitfall , you'll have to live with since the hardware will not change until the next camera model, except if they change the firmware so that this tiny button is replaced by the center OK button (like it was on K10/K200D). Interesting is that in LV, the OK button is used to confirm the AF zone setting, but not for PDAF (gives a hint how logical the design is). I found a way around this: use user modes (user1,2,3,4,5) to preset different AF mode so I can switch AF mode directly with the left dial button, without having to lock AF mode to access drive modes. It's not the best but it can do the job. As for firmware change to use Ok button, I think I'll never see it implemented (they'd have to update the users manual etc). Last but not least, in the K1 you can fully customize the tiles in the INFO menu; that wasn't possible in previous cameras, so I reconfigured the tiles to the functions I use most often, you can also add AF modes there. Use case: just go back to single point AF and use the 4 ways controller to change the drive mode, or when AFC is used, leave the AF point selection open and use the smart dial wheel to change the drive mode.
Originally posted by Cyril_K5 4. The SD cards accessibility
I don't find it to be a big deal since taking sd cards in and out is not something i often do while shooting.
Don't forget that when we get a new camera, there's a time to get use to it and figure out how to use it in the best way. And if the ways K1 is meant to be used is so different from other cameras, Ricoh should tell me, but I can't find such use guide in the manual.