I have some suggestions for the issue view:

• add the pen button, which is used to edit comments, to issues, so one can edit issues the same way as editing comments on issues... (Currently this feature is "hidden" in the menu.)
• use pull to refresh
• use a material design '+' circle button bottom right to add comments
• maybe add a close button to the bottom and replace the menu with a simple share button as all actions are moved somewhere else ;)

Sorry that I completely changed this issue ;)