It's in the title. I always uncheck "post redirection topic" and I imagine that other mods do the same (since we don't see a lot of redirection topics, but we do see a lot of topics being moved). Maybe the check should be un-ticked by default?
Agreed, this bothers me too, I just never remember it when I'm working on the site. Something to keep in mind next time I am - and that should be easier now that there's a topic here to remind me. (EDIT: Let's just have a quick check in the admin panel now, in case there's already an option to change it.) (EDIT2: Doesn't seem like it.)
I've looked through the admin settings, too. Nothing.
I'm 60:40 against making a redirection topic, too. I look at the most recent 50 topics, and there it's clutter. When others look at a single board, it may be useful. I only make redirection topics when I move newbies' topics.
Do you want a hack in the LF source? This makes updates hard.
Do you want to push for a fix upstream?
-- Simon