1. The control has a visible property that you could set to false when you want to remove the poll. You could also implements some logic that switches the item id on a timely basis without making any changes manually. The polls item does not have publication and expiration date. If you want to implement them you will need to override PollItemNew view and PollItemEdit where you need to add your persistence logic. The module is not Generic Content based, which will not allow you to use the dynamic metakeys.
2. You can do this by creating a custom control that inherits from PollBox and expose a public boolean type property as shown below
PollBoxCustom : PollBox
obj = (
] = value;
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items.