Thank you for the feedback - I added it as a feature request. I would also like to provide you with some information on what is going on with the slider control:
Currently we are reworking the rendering mechanism and the logic of RadSlider so we can provide the following features which are set with highest priority in our ToDo list:
- Two-thumb functionality.
- The ability to set the width and height of the control in percents
- More flexible mechanism for determining the physical and logical length of the track (currently Length property sets the physical value and the logical length is being calculated based on MinValue and MaxValue properties)
- Tickmarks for the values the slider takes.
These are the main features and they are scheduled to appear for the Q2 release. We will do our best to provide the "keyboard support" feature as well, however at this point I cannot promise you for sure that we will manage to do that. We will start working on it right after we finish the task which are logged with higher priorities.
I hope this information helps.
All the best,
the Telerik team