Feature request: heat map coastline/polygon edge smoothing

It would be nice when creating heat maps using the FSC BRT, for visual appeal, that there be an option to have the parts of grid atlas squares that extend into the sea be cut off along the coastline, or along the edge of a polygon shape file the user has imported that overlaps with the grid squares

This is something that you would typically do either after using the tool (on the altas layer) or before on your source data, using other well established QGIS spatial select tools. Building this step into the BRT would increase the complexity of both the code and the interface with few advantages over using native QGIS functions (or other plugins) in conjunction with the BRT.