[Edit]: The observed problem was misleading, as it turned out to be rooted in Google Doc's behaviour. Please see accepted answer.
Is it possible to configure the "middle mouse click"-paste option to paste text not where the text cursor is, but rather where the mouse cursor is?
What happens: To be more specific, if I select a text, mouse-over another part of the document and middle-click, the text is pasted "over the selection", meaning I overwrite the selected text with the pasted text (ergo, not much happens). For pasting the text where I am pointing, I first have to left-click to move the text cursor to this location, afterwards I can paste the selection.
What I want to happen: If I remember correctly, there was a time or configuration that allowed me to paste the text just where my mouse cursor pointed, allowing me to select a text, mouse-over a different text part and paste it just by middle-clicking. It was essentially like a simulated left-click prior to the middle click.