Does it make sense to put on tasklists things that are not feasible in a near future?
Yes. You never know how your priorities change, how feasibilities change, etc. You never know if and when the task becomes feasible or inspirational. The only cost of a task on a tasklist is that you may occasionally see it when randomly reviewing valuations. Otherwise, the idea of tasklists is to put all your ideas and inventions there and just estimate the value and time as accurately as possible. The main value of tasklists is that you do not have to come back with your mind to lower priority tasks unless you choose so. At the same time, you never lose a record of your creative effort. The length of the tasklist does not matter. It may be a hundred times longer than your execution capacity.