Are the presale token holders allowed to trade after the ico ends just like the crowdsale holders?
No. the presale holders have 2 option :
a) To lock tokens for 3-6 months and get 5-10% bonus (coming out of the founders personal allocation)
OR
b) Sell preWaBi back to WaBi Project at 8.5USD/preWaBi or 0.25USD/WaBi (reflecting the 1:34 preWaBi to WaBi ratio).
This way, whatever 'dumping' might occur will be absorbed by the project and not the ICO contributors at the exchange.