Custom write/edit post page removing some elements and adding others

Hello,

Is there any plugin or method that can be turned into a plugin to customize the write/edit post page?

Basically I need to filter out a lot of forms (all those in the excerpt, custom fields, etc. section ) remove the chage submitted date option, decide if to make a post private and so on…

I also would like to be able to add forms and applets (such as one to get google sat coordinates when clicking on a point on the map) that help the user.

Also, is there a way to change the title of certain sections? (Like title, categories, etc) I need to rename these with other words.

Thanks for your help!