Strange behaviour of [SHIFT]+[POS1], no possibility to go to column 1

[GitMensch]

In fixed-form reference-format:

1. [POS1] sets the cursor position to the first character written (in the code area) when the current cursor is to the right of this position.
2. [POS1] sets the cursor position to column 8 (start of area a) when the current cursor is not to the right of the position mentioned under 1.
3. [POS1] should ideally place the cursor in column 1 if it is currently at position 8 or before - it doesn't. Workaround: now press [CTRL]+[LEFT] (maybe multiple times if you have multiple "words" in there)

I've "assumed" that [SHIFT]+[POS1] may directly position the cursor in column 1 which is obviously wrong.
Normally cursor positioning functions used with the [SHIFT] modifier does the same it does without it but selects everything from the old position to the new position. This works with [POS1], too and is perfectly fine and correctly.

But when I press [SHIFT]+[POS1] again strange things happen...

What is it supposed to do in this case?

Can we get [POS1] at or before column 1 to jump to col1, too?