If you're using GDAX - use Medved Trader (www.medvedtrader.com) to connect it GDAX and trade - directly from chart or from DOM, open multiple trade tickets, set up scans, alerts, customized technical indicators etc.

This kind of software is common for traders in regular markets, but is severely lacking for crypto trading. Using this software crypto traders can utilize the same methods to trade that Forex traders can (since crypto is basically Forex).

You can also connect it to Poloniex and Bitfinex for data (not trading)

Full integration with other exchanges is coming shortly.

It doesn't cost anything to try - go to www.medvedtrader.com, register, download the software and run it.