What happened to suggestions about giving SS a city up north? I think one workaround could be to keep north pk clear if SS have an unused/less-used area (like Kandori Keep or Lockshear for instance), which connects to their lands, but doesn't connect to their traditional LS enemies (Tower, RE, *oL, Civil Watch) except by their own south lands. Everywhere north then we would just fight as a united front, and anyone who same sided would face punishments from their clans. And SS could do IA stuff like have academies - work with players who want to learn pk etc (great PR :)). This would be LS/SS vs DS - can group etc and play as a side.
Further south, if SS were neutral to everyone else (other than RE, Civil Watch, Tower, and *oL +/- Andor), but there were large tracts where SS were not allowed to fight without permission from the local justice clan etc. So that you limit SW pk to specific zones - and if someone is smobbing plains mistress or whatever, they don't have to worry about Seanchan.
And lastly, the truce thing - and punishments for all clanneds (SS and LS) who violate truce, because it is dishonourable and unsoldierly and so on.