Well, yes and no. You can use the todo system, as you mention, by adding TODO or LATER or DOING or something. And in a block, you can also do something like

Well, yes and no. You can use the todo system, as you mention, by adding TODO or LATER or DOING or something. And in a block, you can also do something like - This is an item * [ ] This is an open checkbox * [X] This is a checked checkbox and it will render as expected. However, you can not write - [ ] This is a checkbox and have it rendered as a checkbox, which I think is a bit strange