severity: wishlist

There is this nifty feature of quick-calc (C-x * q):

    (info "(calc)Quick Calculator")

    If you finish your formula by typing <LFD> (or `C-j') instead of
    <RET>, the result is inserted immediately into the current buffer
    rather than going into the kill ring.

This should be mentioned in the doc string.

In fact, considering that inserting the result of a quick calculation
into the current is an elementary use case, quick-calc's prefix arg
should be dedicated to enabling this feature.