(3) "Left-alligned" table cell: After saving the page, a table cell that is originally "Left-alligned", suddenly becomes "Right-alligned" or sometimes "Center-alligned". Try it.
Cannot reproduce this on either Chrome of Firefox on Windows 10. I need more information, to begin with: what browser and what OS.
As for the others, see:
https://www.dokuwiki.org/plugin:ckgedit#html_blocks
Attached is a sample, showing what can be done with the technique described in the above. You save the table as html and when reloading it into the editor, you can continue to work in the table, add rows, columns, delete, etc.