I'm quite back
I'm not going to quote everyone but I'm trying to answer to all last messages...

New Languages: I can add new latin-based languages easily, check first post in "FastSMS" thread to discover what I need. I absolutely can't add new languages(that I don't know) without support.
I'm planning to add also support to non latin languages, strating from greek, but here I need a collaborative people to understand the language...

New Layout in qwerty: As before I need support from people, but I can easily add they. A lot of people ask for something and then disappears: sorry but I only know italian and a bit of english

Bug@reboot: I noticed the same thing while trying to first start vkb in conversation in portrait. ATM you have to start fastsms from icon, don't close it, and then use conversation, or mail or etc as normal (fastsms will be hidden after the first use of the vkb)

Symbol: I will add this layout and also a "smile" one. I have to say that in qwerty there are few symbol still missing and while using the T9 layout you can modify plain.txt or the first part of your language.idc

hildon-desktop: I will try to manage this adding the features to autostart fastsmsevo at boot time (this may also fix the problem linked to first start in conversation) but please consider that restart hildon-desktop is not an every-day task