Hi Wim, one options is to use Transform > Orient > Line to Line. That lets you draw a base line spanning your original object, then you draw a series of lines and each line you draw creates a copy that is rotated by the angle between the new line and the base line and scaled by the difference in length between them. It's a quick way to do rotations and scaling in one operation.

The other option is you could draw a path curve and use Transform > Array > Curve to make full sized copies and then use the ScaleArray plug-in to scale them down. You can find it here: http://kyticka.webzdarma.cz/3d/moi/#ScaleArray

But neither of these would do only a very specific angle or scale factor for each step if that is absolutely needed. For very specific values you could look at modifying the "ScriptArray" plugin to have the particular behavior you need, it's here: http://moi3d.com/forum/index.php?webtag=MOI&msg=5595.18

- Michael