for my balcony I very precisely know in which Az/Alt area an object has to be to be visible. Half of the sky is not visible and some trees limit this further. A coordinate filter allowing to fitler with Az/Alt instead of Ra/Dec would help immensely to select visible objects, if you have a fixed location (like a balcony). This is already semi implemented with the “x minutes y° over the horizon” filter. This could be extended to “x minutes y° over the horizon and between z° and a° Az”. Even an upper limit for Alt could make sense, as my telescope has problems targeting objects very high up.