That's exactly how we use the backlog: Whenever we come across things which could be improved, we create a ticket for it. That could be UX improvement, ideas t

That's exactly how we use the backlog: Whenever we come across things which could be improved, we create a ticket for it. That could be UX improvement, ideas to speed up the CI pipeline, or general code improvements which take more than an hour max. Each sprint one person (we cycle though) can use 20% of his time to do these tasks (we call them greenkeeping). Works very well so far.