Are you saying that if you schedule a change for publishing next week that you won’t be able to make any other changes in the Customizer until that time passes?
>> No, I doesn’t mean like this.
There can be many changes after Schedule things, but the things is operating like if we do any changes after schedule and if we publish it then it is Publish everything by including Scheduled things also.
Example:
-I wants to Schedule Header Image for Next Week, And I have Schedule it.
-I have done some Style and Color changes(In customizer same panel only) after schedulation
-Now I wants to publish my style and color changes and don’t wants to change Header Image. But it is not feasible as of now from this Schedule feature, this is publishing everything that means Style and Color changes as well as Header image change.
In order to follow with that manner, There should be individual schedule for each module of Customizer panel.
Suggested Plugin is also not compatible for same. And this should be implementation part of Core WordPress.