If there is not a setting, then either edit the code or convert to a morph, or draw it in separate.
I used the railing tool for all of my gutters and Eave items since it links to The roof notes but if you edit things correctly you can use a post as the downspout which gives you a decent amount of control as to the placement.
custom profies also work... or for that matter, just turn the downpipe hole off and place the downspout where you want it... nothing says you need to show a hole in your gutter to connect a downpipe (unless you are doing a rendering of your gutters! 😉 )
BIM solutions and trouble shooting (self proclaimed) expert. Using Archicad 26 5002 US on Mac OS 11.5.2