QOL Suggestion for Gangplank

Gangplank can chain explode his barrels, but the only indicator that they are linked are a powder trail, and that doesn't appear until after they are placed. I suggest there be an indicator, for example a color change within the radii of the barrels' aoe when the barrel you are about to place is close enough to chain. This will make it easier to maximize the spacing of the barrels during team fights, instead of over-overlapping barrel explosions, using 4 barrels instead of 3.