Module development and code questions

HI,everybody, I found somebody using the module as Tidbits! The module is set some questions,and the user can answer it! Every one has his own answer!
for example:questino and answer

question:You couldn't pay my kid to
Hurry up!

question:Product I can't live without
Baby wipes, I don't know why...

question:Favorite indulgence
Coffee :-)

question:Best date night
What?

question:Last book I read
The Devil's Sandbox by John Bruning NEW

I'm trying to work out how to create a new content type from within a module in Drupal 5. I was wondering if this had changed from 4.7 due to the new create content type feature. Is there an API or do I just insert a new entry into the node_type table?

I am trying to figure out how to create a single view that incorporates blog entries and items from the various news aggregator categories that I have. I would like to have them all sorted according to published date, so that everything is listed in chronological order. This means that rss items that are found in between the publication of two blog entries will appear in between those two blog entries in the feed.

In my module, using hook_user to remove Username from required fields i cannot set $edit['name'] to be the same as $edit['mail'].

I want workflow to be - user register (email only), Confirm, edit profile to change username (Display Name)
With this code the process borks in user_validate_name at 'You must enter a username.' seems the $edit variable did not accept new value.

If you do not know coolfilter is a module that allows users to embed video codes into posts and comments.

I was wondering if anyone knew of a way to limit embedding to certain user roles? It is costing me too much bandwidth to allow all people to embed. So I would like to limit it to Staff use only.

Any help would be greatly appreciated.

Is there a setting or a module that could remove users after a certain inactivity time? For instance, what I have for some of my users is this: