Add Categories support

OK, I got the problem pinned down as the fault of Tagadelic.
tagadelic_nodeapi loads tags into a wrong place, overwriting container's freetagging flag. Then it proceeds to use 'tags' as an array in tagadelic_tags_lists. There are also suspect uses of 'tags' variable in tagadelic_node_get_terms and tagadelic_block.
Questions:
1) Does tagadelic really need a nodeapi to load tags or can it rely on 4.7 core? Doubt it.
2) Whether or not nodeapi is used, where does tagadelic get the tags from for the functions mentioned above?
3) Is there a special handling required for category module or taxonomy wrapper should do the job?

More here: http://drupal.org/node/58821