LESS env var and a pager

I was recently trying to work out why when git's output is piped
through a pager, it doesn't use the alternate screen buffer:
https://bugs.kde.org/show_bug.cgi?id=201899

Conclusion: removing the X option from the LESS environ var produced
the results I wanted (allow mouse-wheel scrolling, output is hidden
after closing the pager).
One relevent post I found:
http://article.gmane.org/gmane.comp.version-control.git/29565/match=less+frsx

So maybe it'd make sense to change this in pager.c to:
setenv("LESS", "FRS", 0);
(or even just FR:)
setenv("LESS", "FR", 0);

Just a suggestion of what seems preferable to me.