When using Blender on Ubuntu the typing speed is very slow, making very difficult to use. Using a standard keyboard works normally, and all other programs work normally with the Twiddler. I have tried both USB and Bluetooth. I can't figure out why Blender would operate differently with the Twiddler. I have reproduced this issue on Ubuntu 14 and 15 on different computers.
Interesting...All the Twiddler does is send HID codes to the OS exactly like your keyboard.
Are you working with a custom chord map?
And it works fine in all other apps?
Not sure why, but upgrading Ubuntu to 16 fixed this issue for me.
@jschaefer could it have been a BT stack issue or a BT dongle placement issue? Always test with Line of Sight to make sure everything is working well.