FCKEditor has had its hey days, worked well with drupal as well, but it was bloated and slow. Then came the CKEditor, shiny new and fast gui editor. There is a drupal 6 & 7 module for CKeditor, but the module for drupal 5 is missing.
Understandaby, we dont want no one to use drupal 5 any more... however there are still some legacy systems using drupal 5, like the one i am currently working on. upgrading to drupal 6 is not straight forward and requires approvals and budgets from tons of people.
The next obvious option is to write a custom quick fix to make drupal 5 work with ckeditor, ckeditor and drupal 5 works out of the box with wyiwyg module but unfortunately only works on drupal defined or cck defined content types, if the content type is defined programatically - it doesnt work with those textareas.
Hence a need for a custom module like the ones available for drupal 5 & 6. There may be a work around i am thinking but havent yet got time to get around to trying. I plan to use hook_form_alter() to insert a filter element on the forms and try to get ckeditor work like that. May be people have tried this earlier and it is working, but a google search did not find any thing promising.
I do not have a capacity to currently write a contributed module for ckeditor, but would like a quick fix. Will post later it i am successful.