In addition to all the other cool stuff available in BizTalk Server 2004 Service Pack 1 is the addition of the Additional Flat File Schema Properties to the schema properties window when working with Flat Files. 

Now, properties like Allow Early Termination, Generate Empty Nodes, Lookahead Depth, Parse Optimization, and Suppress Empty Nodes can be set inside Visual Studios.  This will eliminate the tedious and error prone manual editing of the schema using notepad.  Error prone?  Yep, I messed this one up once...