Hi vagelis28,
Question 1.
In the code above, I add section style="visibility:hidden" into the table to hide the size section of the Insert Image dialog.
Question 2.
The picture you insert will remain the original size. But you still can change the size in editor after the insert.
If this does not meet your requirements, please explain your requirement on detail. I will create the example for you.
Regards,
Ken