Hi Steve, have you had a chance to try this on your Android since yesterday? I think the update I made to fix copy-paste may have also fixed this.
The reason I say this is that I just tried it on my Android - a Samsung/Google Nexus S - and it worked (the Enter key did successfully end the input line). But it may also be due to us having different phones, so when you get a chance to try it out again, please let me know.
Also, thanks for your patience and for reminding me about this issue. I remember you first raising it a long time ago.