The source IR command is a single IR code that toggles sources. The code never changes. You can learn it in multiple times and all it will do is toggle sources. Any learning device you use will do the same thing. The TV manufacturer doesn't always provide multiple input buttons, but they may provide it in some form of IR protocol.

For example, Sony, Samsung, LG - they all are the same. All remotes have a single "Source" button. Learning that button, and it will simply toggle the sources, just like the factory remote. However, these companies also provide separate IR codes via the protocol which doesn't need to be learned in but manually entered in pronto form into the IR library manager.

You should always stick with models that have discrete Power AND Input codes. I would contact that TV manufacturer and see if they have the commands in another format, or even make provisions for discrete input commands.