I often miss the opportunity to easy place another dropdown-menu beside another one

Such lists are independent objects with absolute position. You have to place them according to the longest option of other ones. You could define a starting point with conditional coördinates according to the chosen element. But since you want (to easy place' it's much fuzz for little gain.

But an interesting option could be to show all chosen options in an extra texr using the TableText Command which does aligns all elements in the table properly

Yes, but sometimes the distance between the two menus can be very large which doesn’t look very nice.

It would be nice if it was possible to use both an absolute position and a position point for a dropdown-menu like for many other objects.

Or maybe better: you could make a more easy way to get dropdown-menus placed according to each other by using the absolute coordinates so that the user just have to enter a distance between two related dropdown-menus and which one is going to be placed to the right of the first one.

Then there would be a much easier way to get them placed according to each other instead of first use a vector to calculate the absolute coordinates for the first dropdown-menu and calculate the length of the chosen element of it and then add the distance to get the absolute coordinates for the dropdown-menu beside it and then calculate the coordinates for the other dropdown-menues beside it and then define the coordinates for the dropdown-menus.

And I also often forget how I get the coordinates to the vector that is used to calculate the absolute coordinates as much time passes between I need to use it and I use so many other things in the meantime.