if you need fulltext indexing then make that table MyISAM
or
push the columns that you need fulltext indexing on into another table
retain the MyISAM on the old table, and implement a one to one realtionship through software.
enforcing relationl integrity through INNODB is fine, its easier, but there is no reason why you cannot do effectivley the same task under software.. thats the old way of doing things, and it can be just as effective PROVIDING every piece of software writing or modifying that table behaves and sticks to the rules that it implements RI.