You might benefit from a Kinesis Freestyle Pro keyboard. The spacebar is split (the whole keyboard is actually) and all the buttons are completely configurable

You might benefit from a Kinesis Freestyle Pro keyboard. The spacebar is split (the whole keyboard is actually) and all the buttons are completely configurable: remap and macros. If you don't use home and end keys, or the left-side spacebar (or any key!) you can bind them to whatever you want.