system-wide CTRL + Shift behaviour

Hi there,

what I think is not working logically right in the "marking system" (ie selecting multiple files/emails etc.) is this:
Let's say I have emails like this:
email A # > 1
email B # > 0
email C # > 1

If i want to mark emails A and C (mind you more then 1 each) then the - in my eyes - most logical way to do this would be to press and hold SHIFT1, select first and last email A /Shift1, then press and hold CTRL select the first email C, then press SHIFT2 select the last email C /CTRL /SHIFT2.

To shorten this paragraph: I cannot "block-select" two blocks when there's a separating block in between. That doesn't feel rational.
Well thanks for your time excuse my english and I hope there's anyone out there having understood what I am trying to tell.

turbooster

p.s.: this is, of course, the MS windows behaviour and I think many switchers are used to it