Motorola Droid X :: APP - ROOT - Keyboard - Keyboard Manager - Dual Keyboard - Portrait - Landscape Switch

I tried it and it works so far.

Dev = ne0fhyk from XDA.

From the XDA forum: Link to app page = [APP][ROOT/Keyboard] Keyboard Manager - Dual keyboard: Portrait/landscape switch - xda-developers

Verbage:

Keyboard Manager allows you to customize what keyboard (input method) appear on input based on your phone orientation.
It displays the keyboards you have enabled on your android device, and let you select one per orientation (landscape/portrait).
As your phone switch orientation, the app automatically switch the keyboard.

Requirements:
- Rooted android device (app was tested on Samsung captivate 2.1)
- Root Explorer app, or similar app that allows you to edit the permissions of a file.

To install:
1- Download the app (KeyboardManager.apk) on your device sdcard.
2- Using Root Explorer, move the apk file to /system/app
3- Using Root Explorer, edit the file permissions like below:
-- User: 'Read/Write' checked
--Group: 'Read' checked
--Others: 'Read' checked
4- Exit Root Explorer

The app should be visible in your launcher as 'Keyboard Manager'

Update:
- Added option to disable notification icon
-' start on boot' feature is disabled because it's not yet complete and tested... Sorry for the confusion

Bugs:
-On certain applications (i.e: Messaging on Samsung Captivate), the input window occasionally freeze on orientation switch. Exiting the app, and resuming should fix it.

The app is still in development.