EDIT:
This idea is already mostly implemented.
See my comments some posts below.
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Hi Yutaka,

I want to set an marker,
then go elsewhere in the document
by scrolling around or use find to find something,
then do an selection to that marker.

Therefor i can imagine at least this improvements.


1.)
New shortcut toggle for:
* Start an Selection / End the Selection

I would press e.g. F8 to start an selection,
then i would go elsewhere,
then press F8 again to set the end of the selection
and all between is selected.



2.)
New "Edit > Extend selection" possibilities
* Select to next bookmark
* Select to prev bookmark
* Select to bookmark # n

I would set an bookmark,
then go elsewhere,
then use one of the new commands
to selected all between current point and an bookmark.


3.)
New command "Sticky Selection"

I would make an selection,
enable Sticky Selection,
use one of the current available movements
to selected all between current point and the initial selection.

Called "persistent selections" in some other editors.


What do you think?


.