When I edit a table I would expect tab to create a new column if pressed when the cursor is the last column. It however makes the cursor jump to the first column of the next line.
Is there any other key that allows to create a new column instead?
Press tab, SHIFT+TAB…
You should be able to assign table related hotkeys in Settings > Hotkeys 
…
(They’re just unassigned by default)
Another way, if you don’t want/need to assign shortcuts/hotkeys:
When your cursor is placed in a cell in a table, you can trigger the command palette (ctrl/cmd + p) and look for the table related command available
Right, I didn’t think about it. It would be much better and intuitive if the column is created with tab when the cursor is in the last column. This I cannot achieve with a custom hot-key, but I guess I have a good workaround 
It will be more comfort if users can customize the behavior of the tab and enter keys in a table 
