about customizing item form

Hello

actually they are not

-- because it is not just them:

1. you have in every field configuration you have ability to customize field behavior in item form
2. you can order your fields per content type
3. you can use groupmarker field to shape the Content Type TAB
4. Item form can use ACL for edit privilege (enable in each field)
5. You can hide fields in frontend / backend and maintain their value
6. You can have "untranslatable fields"
7. The item form includes extensive use of CSS classes to allow styling customizations
8. smart validation with inline messages for correct values and multi-inner TAB focusing
(and some further improvements in upcoming version)
(also see validation in text fields)
9. others that i forget

Limitations (which in your case, are important)
-- you can remove some CORE fields but most are needed and currently can not be removed
-- core fields positioning is fixed
-- core TAB order is fixed