sql*loader is not too intelligent.
a standard workaround we always do ( if our custom perl parser is not helping )
1. create a temp table with c1,c2,c3,c4 order.
2. insert records into this table using sql*loader as-is.
3. later you can copy the records into any tables in any order u want.
   insert into table2 ( select c1,c3 from temp_table);]]
   insert into table4 ( select c2,c4 from temp_table);
   or 
   you can write an after insert trigger in temp_table.
   so thbat, every inserted record is again insert into the corresponding tables table1 and table2.,