1) It you would like you can post your modification of the RTL / LTR solution in our Code Library section
and share it with the community. Of course, we will award you with Telerik points for your valuable contribution.
2) If you would like you can implement your own custom Line Height dialog which will contain input controls in which the user will be able to add custom values. You can find how to create custom dialogs in this help article: Custom Dialogs
Another approach is to add a new item in the Line spacing custom dropdown which will launch a prompt in which the user will add a new value.
3) Thank you for the clarification and provided information. I logged your feature request in our PITS system and updated your Telerik points for it. Here you can find the PITS Issue: Public URL
4) This is not a bug. The fullscreen mode is calculating the position of the page from the top left corner of the page and this works correctly in LTR mode. That is why I provided a solution with two editors in your other forum post. If you implement your own solution and share it with the community we will gladly award your work.
the Telerik team
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