[orca-list] One should be able to use both CapsLock, Insert and KP_Insert as Orca modifiers

[Zahari Yurukov <zahari yurukov gmail com>]

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Hi,
i think it is important for the user to be able to use all three keys
as Orca modifiers, cause this will enable executing of most commands
using only one hand.
Now, if Insert and/or KP_Insert are set as Orca modifiers, this leaves
the left side of the keyboard out of reach, and vise-versa - if
CapsLock is set as Orca modifier, this leaves the right side of the
keyboard out of reach.
This is similar to the reason behind that we have two pears of the
standard modifiers - Control, Meta, Super, Shift etc.

I suggest transforming the combo box "Screen Reader Modifier Key(s):"
in Orca Preferences -> Key Bindings into three checkboxes - for the
three keys: Insert, KP_Insert and Caps_Lock.

May be it's not bad idea to add a 4th possible key - NumLock, which
could "replace" the Insert key in situations where there are problems
with the Insert key, for example with some keyboards or enviroments.

Best wishes,
Zahari
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