Help with Hotkeys to tweak selection area [SC]

[tomos]

What are the shortcuts for tweaking the selection area?
They may be in the helpfile but I coulnt find.
(I think these shortcuts might be working a bit wonky - or maybe it just me)

To be 100% clear:
Select an area.
Hold mouse over one edge and check the "zoom-box" bottom left in main pane.
Various shortcuts work to move that edge, one pixel at a time.

TBH I can never remember them and chance my arm and usually figure it out.

I tried Ctrl+Arrowkeys and Ctrl+Alt+Arrowkeys and Crtl+Shift+Arrowkeys.
All seemed to work, but today they appear to affect the frame at both sides, i.e. the selection-box moves, instead of becoming one pixel smaller (or bigger) on one side.

So maybe if someone could tell me which shortcuts I *should* be using, hopefully then I'll understand better/explain better what's happening.
Thanks.

[mouser]

I think this screencase shows the different keyboard shortcuts for nudging selection:
http://www.donationcoder.com/screencasts/dc/3ds/sc25/sc25.html

Basically:

• Arrow keys MOVE selection without changing its size
• Ctrl+Arrows expand or shrink selection from center
• Alt+Arrows adjust position of top left corner of selection
• Shift+Arrows adjust position of bottom right corner of selection

[tomos]

Thanks mouser -
I hadnt known about the Control one(s) -
that way why I was getting unexpected behaviour
(I had thought that the other ones worked with control).