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Date: Sun, 13 Sep 2015 14:08:25 +0200 (CEST)
From: Roland Lutz <rlutz AT hedmen DOT org>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] off-topic: key bindings
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On Sun, 13 Sep 2015, gedau AT igor2 DOT repo DOT hu wrote:
> I figured the expectated key combinations of the modifier-based map never 
> start with an alnum character without a modifier. This makes the following 
> simple policy feasible:
>
> 1. if the first key is with a modifier, it is a single-stroke hotkey (e.g. 
> ctrl+z or ctrl+s)
>
> 2. if the first key is not alnum, it is a single-stroke hotkey (e.g. arrow 
> keys, escape, F1, enter, etc.)
>
> 3. if the first key is alnum without a modifier, it's the first character of 
> a multi-stroke command
>
> Rule 3 removes 36 keys from the single-stroke world but makes it possible to 
> use best of both worlds without collision.

Why do you need this distinction at all?  Just define both "ctrl+z" and 
"ctrl+x u" as hotkeys for undo.

You could also let the user select between a set of keyboard schemes 
(multi-key/alnum, Windows-like, Emacs-like).