The GTK+ multipress input method, that Openismus created for a customer, has now been added to GTK+‘s trunk branch, to appear in GTK+ 2.11/12. It still needs a couple of minor improvements, as noted in that bug report.
For people using GTK+ 2.10 and earlier, the standalone version is still available.
When will GTK+ 2.12 be released? Can’t find it on their site.
Frank, I guess they have not quite decided that yet. Hopefully it will become clear soon.
Any screen-shots of this? Sounds very cool
Chris, it’s very simple. It just looks like regular text entry, with an underline to show when you are in compose mode, as with other input methods. There is no extra visual indication of what might happen next, though that would be nice.