being unable to zoom efficiently on a picture in Kodi

I have a few problems with kodi pictures and I wish there was a fix for it.

I convert pdf files into jpg format and then read them on kodi however I allways have problems with zooming in/out when I use a joystick.
when I press up botton it zooms in way too much and when I press down button it zooms out way too much.
When I use keyboard I just press 3 button and zoom level is almost ok however using joystick is more comfortable in comparison to a keyboard.
I wish there was a way to save zoom level and point of zoom. for example when I zoom it allways zooms in the middle of the picture and then I should move up to the top of the picture and when I go to the next picture I should all these steps once again.
If therewas an option for saving preferences it would have been great.
Another problem that I have is related to the small tombnail of the picture on top right side of the screen.
When I zoom it appears and covers a percentage of screen and in most cases covers something important that I have to read and then I should salve this problem with a combination of zooming out and moving which is not ideal.

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