--without-toolkit-scroll-bars at runtime?

[David Kastrup <dak@gnu.org>]

Hello folks,

how difficult would it be to make "--without-toolkit-scroll-bars" a
runtime instead of or in addition to being a compile-time option?

Background: for serious use, the "modern" scroll-bars (everything
Post-Athena) are deficient.  You can't switch between back- and
forward motion without moving the mouse, you can't control the scroll
amount to get just the right window start for getting a
block/function/loop fully on-screen.  Something which, by the way, is
also hard to do by keyboard given Emacs' recenter policies.

Now recompiling Emacs for maximal productivity is a better option than
not being able to do this at all, but it does not lend itself to the
"sysadmin has weird settings that he does not enforce unto his users
unless they ask for it" scenario that is quite common.

Since this is not just a how-things-look, but quite a definite
usability question, being able to deviate from the toolkit default
without recompiling would be nice to have.

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum