UPDATE: Good news, Julian Smart the author of
Ecub kindly replied to my email and said that the simple usability features suggested would be added to a to-do list to appear in a future release of the program.
After clicking 'compile' the log tab will show automatically to the front so the user can read 'compile successful' straight away. The log window does come to the front automatically but only on errors. Also the 'Launch' button will hopefully tell the user if no *.epub or *.mobi filetypes are registered on the system and to install/set up an external viewer instead of nothing happening. Although I would imagine this might be difficult to implement accross multiple platforms. Just a few simple things which should hopefully help new users to the program find it a bit more intuitive!