Hello Adam,
As part of our 3.7.0 release, we will introduce an event that will fire when the slots of the scheduler are rendered. This event will allow you to add a custom CSS class and cascade styles to a particular slot based on a condition. Together with the OnSlotRender event, you can cancel the OnEdit event to achieve the desired behavior.
I have added your Vote for the OnSlotRender event and you can click the Follow button to receive email notifications on status updates.
That being said, I am marking this feature request as "Declined" as the behavior will be achievable with other features.
Regards,
Svetoslav Dimitrov
Progress Telerik
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