sit-for divergent behavior in emacs and emacs -nw

[D . Goel]

What is the way for me to get emacs to start doing somethign and keep
doing it every 2 seconds as long as it remains idle; so that i can
work on somethign else ?  Start a run-with-idle-timer that calls
sit-for every few seconds, right?

but The problem seems to be -->

Insert (sit-for 3), press C-u C-x C-e, and now try working on another
application --- to do that, you will need to move mouse, or press
alt-left to swich viewports in sawfish etc. 

But as soon as you move the mouse, or press alt-left, the sit-for
returns nil ((even though the alt-left never shows up in M-x
view-lossage)).

The sit-for behaves differently in emacs -nw. 

Is there an option I am missing?  Or Should there be an option in
sit-for to behave as if in emacs -nw and hence i should file a
wishlist bugreport?



(A lame :=)  example of the "use" i am missing is:
 
 see vel.el i posted on g.e.sources recently... say, i want to leave
 my emacs scrolling up slowly, while i go do some other work; I can do
 that in emacs -nw but not in a normal emaca..)



DG                                 http://24.197.159.102/~deego/
--