After one month of development, EinkBro comes with more feature now! And it's released on Google Play Store too. Have a look at Google Play Store if you wanna try it:
https://play.google.com/store/apps/d...eaukao.einkbro
To name a few:
* bold font option
* quick change font size
* print pdf (you can also set the default paper size in settings)
* customize your own tool bar
* configure touch area on screen to turn pages (just like normal ereaders does)