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on 1.1 there wasn't spaces and spaces caused troubles, now in 1.2 they are in place...
I think keeping it without spaces will be better, have no idea what will came with 1.3 or 1.2.1 update (which there is a special part for PHP Define), which will try to update some of the reported bugs with XOOPS and banned one.
define('_AM_NEWBB_AUTHOR_NAME',"Author");
No spaces, no trouble... and what about INIs ?
There will be only
AM_NEWBB_AUTHOR_NAME=Author
or
AM_NEWBB_AUTHOR_NAME="Author"
No spaces :)