Posting to the front page should be a different decision from posting.
For example, instead of just having +1 fp; +1; 0, and -1 votes, have: +1 fp, section; +1 section;
+1 section, no fp; +1 fp, no section; +0 fp, section; -1 fp, section
In other words.. have "two" scores a section score and a front-page score, both or one of which could be modded by a vote.
IOW, it maps like this.. if a story gets rejected from its section then section is demoted to diary or replaced with a "special" section or someting but it could still be fp, ie,
possible votes:
fp score sec score
Post: front page, section +1 +1
front page +1 +0
section +0 +1
don't care +0 +0
front page only +1 -1
section only -1 +1
dump it -1 -1