is this possible using the new rectangle mark mode?

[Darren Hoo]

kill a rectangle marked region ending with a line that is not the
longest line like:

    aaaaaaaaaaaaaaaaaaaaa
    bbbbbbbbbbbbbbbb
    ccccccccc

and yank it to these lines:

    1
    2
    3

and I want it to be either this:

    aaaaaaaaaaaaaaaaaaaaa1
    bbbbbbbbbbbbbbbb2
    ccccccccc3

or this one:

    aaaaaaaaaaaaaaaaaaaaa1
    bbbbbbbbbbbbbbbb     2
    ccccccccc            3