New flexinode field type for page type select PLEASE?

Jonbob can you please let me know if you can set up a new flexinode field type similar to this nodeselect one for pages.
That is I need a select field that allows you to choose from a drop down list an item of "page_type = flexinode_pagetype"

1. So lets say we have added a flexinode called textbooks and added 5 books of that type of flexinode page
2. Now we want to add another flexinode called courses.
3. In the courses flexinode you now want to add a new field (just like you would add a text line field or textarea field) but it will be a new field type (one you will have to write jonbob) called something like 'page type select'
4. Page Type Select : will allow you to list (dynamically when the form is shown and you hit the drop down list - or before) all of the page types (textbooks in this example) that you specify.
5. This will be similar, but not the same as, the categories check box that says what page types to apply the category to. I dont think you will be able to use the categories for this, as you want to be able to list the text books down the page, but I guess you may want to use categories as it may(or may not) simplify things.
6. When adding a new Course (2 above) page, you will have a choice of selecting one of the textbooks that get listed in the drop down select menu. This may also be a multi-select so that you could choose more than one textbook for a course.
7. If this could be done - brilliant. I cant seem to figure out how the flexinode fields work but if some one can point me in a good manual I will try do this myself

I am going to post this as a new thread which is here so please post to it