Just uploaded a unofficial 'patch' for vertical alignment of table cells.
You can find a .zip file under 'Source Code' > 'Patches' > #7398.
Add the code in '_Enumerations_vAlign.txt' to '_Enumerations.cs'.
Add the code in 'Table_vAlign.txt' to 'Table.cs'.
Again, this is not an official patch, but you can give it a go if you want the vAlign functionality right away.
I can't provide any support on this. Use at own risk ;)