I am afraid that you can not specify the line spacing for the default list style. You can access all of the available properties by using the DefaultListStyles static class. Here is example on how to do it:
Possible workaround can be to determine the newly added paragraphs with assigned bulleted list style and apply them the needed spacing. This can be done by attaching to the CommandExecuted event of the RadRichTextBox. You can manipulate the lists using the RadDocument.ListManager.
Here is an article
explaining the lists in RadRichTextBox.
I am also afraid that there is no default height for table rows. The workaround here is also to attach to the CommandExecuted event and listen for the InsertTableCommand, InsertTableRowCommand, InsertTableRowAboveCommand and InsertTableRowBelowCommand and change the height of each row.
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