I just tried the deposit using e-cash wallet, I chose Dana this time as it is e-cash wallet that I use frequently.
Just for your information (or to anyone who is going to deposit using e-cash wallet), here is the process:

• We need to decide the amount first
• Click the KIRIM/SEND button and it will redirect to new page contains of the QR code
• Open our e-cash wallet then scan the QR code
• Amount to send is automatically added once we scan the code so there is no chance to send wrong amount
• Once we send it, it will be automatically credited into our balance (instant)

Some important points to remember while using e-cash wallet:

• QR code can be used one time only
• There is an expiration time for the QR code, so we need to process it before the time limit ends (15 minutes IIRC)

I think it will be my first choice to deposit now as I dont have to pay transaction fee to deposit.
One thing to hope that there will be also a way to deposit using e-cash wallet.