A) Use a shovel (or spade, less recomended for slowness) and just keep digging and hoping
C) No, not really (unless someone can tell me a good use? You can use the bags with a slingshot for quitte some damage if I'm correct, but... It's frikkin gold dude :P)
D) Just to show off for now, might have benefits later
E) Not yet implemented
F) I was wondering this myself as well...
G) Read the topic and there is a way to make it stop breaking at all. For some it breaks every time in 5 hits, for me it takes like 500 hits. I didn't modify anything though.
H) Hmm, there are holes in the shell meaning it is not really smart to put water in it
I) Unless my memory is wrong (wich it most likely is) you can tame raptors too. I forgot how though, could have been with bones (lion rock)
I²) It's more like a side gain, spend a week building them and you will have enough food to empty hunger (and most of thirst) daily.
It's a matter of having time for it.
@I) If im correct now you can't tame them, but you can use the editor to modify their behaviour to tame them and be able to ride them.
Dont know for sure if you can tame them ingame though.