I had an idea about tx fees.  I would to see the clam client allow people who stake their clams have some control over the transaction fees they will accept.  Also the ability client to publish their fee requirements into the block chain.  This way poeple making transactions could dynamically see what the required tx fee will be needed to get their transactions approved.  If the client scans last X number of blocks for example, it could calculate the probability or time it would take to get the transaction approved. 
This would provide a self adjusting fee system.  The way bitcoin seem to work to me, is the client sw is manually tweaked with new tx fees structure depending on the price of the currency relative to USD and potential threat of spam.  So I thinking this would be better way to handle this.