Re: How to bind isearch-repeat-forward to F3 in a certain mode only?

[Rusi]

On Tuesday, July 28, 2015 at 2:00:45 PM UTC+5:30, Marcin Borkowski wrote:
> On 2015-07-28, at 02:26, Ian Zimmerman  wrote:
> 
> > A bit more seriously, I mostly agree with Emanuel.  F3 in particular may
> > be problematic because of [1] (unfortunately hidden away and so often
> > overlooked).  The exceptions are F10 for menu and F1 for help, which are
> > well established hard to replace with single-keystroke bindings.
> 
> Funnily, of a few Fn bindings present in (my) Emacs, F1 and F10 are
> among those I *never* use...  Help is C-h for me, and I haven't used the
> menu for more than decade.  And I explained the rationale behind my idea
> of binding F3 in an earlier post.
> 
> BTW, how do you guys use keyboard macros?  "C-x (", "C-x )" and "C-x e"
> are so inconvenient compared to F3 and F4...
> 
> (OK, this Emanuel doesn't have to answer this last question - he doesn't
> use kbd macros, and doesn't even know what he misses;-);-);-).)
> 
> > [1]
> > https://www.gnu.org/software/emacs/manual/html_node/elisp/Key-Binding-Conventions.html#Key-Binding-Conventions

I am actually a bit surprised by Ian's quoting the above page.
AIUI that is for *elisp library developers* to keep some order in keybindings
If an *individual user* is prevented (even suggested) to not use da-da
to do de-de, then what's the point of emacs really and its famed 
customizability?