I'm new to Etherium and using the Mist wallet.  I'd like to participate in this Bancor ICO, but I don't think this wallet has a way to set the Gas Limit which Bancor says is required to be 200,000.  The Mist wallet doesn't seem to display Gas anywhere let alone give me a way to set it.  I'm sure the command line does, but I'm not comfortable enough to use that.  Should I just ignore that requirement and hope for the best?