Without javascript and in emails banners will changes on page reload.
If javascript available you can put code in any div container and it will take sizes of it.
You can put any HTML code into title field it will be shown if no image set for banner.
In static mode program find the maximum banner in rotator and set sizes of container when generate code. If you choose another image for banner you need to regenerate the code or change container sizes manually.
Images are shown in 100% as they uploaded. Please upload the images with correct sizes.