This issue with the table pasting is indeed reproducible with the 2014 Q1 version. I am glad to inform you that for the upcoming release the paste functionality will be greatly improved and this matter should be resolved. I suggest you trying again the same scenario after upgrading with the 2014 Q1 SP1 release.
The problem with the expanding cells is not reproducible on my end and I will need more information about the exact steps leading to this issue. Additionally, it would be helpful if you could check the exact mode under which you are testing (You can check this via the dev toolbar).