I am actively working on adding Goolge talk Voip calling (XMPP Jingle) support. Progress has been pretty rapid so far. I hope to have it in the next release in September.
Things to expect in the September release.
1. Uses standard iphone notification sound and vibrations.
2. Fixed bug where sounds didnt play
3. Uses device/switch settings. Removed vibration options in Monal settings since they are redundant
4. Correctly detects https links in chats
Also worked on the ability to not save the password at all and enter it on every login.
Making good progress on that. I think I am about 50% done.