I've corresponded with TiVo on this issue. Here's what's going on.
- The 10068 code is a straight capture and is indeed more reliable. However, it contains a lot of repeats and is so long that not all of the IR codes could be included. Thus, the Enter key was left out as being not absolutely essential.
- The 10069 code is a shortened version of the 10068 code with enough repeats taken out that the Enter key could be added. Without as many repeats within the IR sequences for the digits, this code is less reliable.
So, I would suggest trying to see if you can get 10069 to work by carefully lining up the IR emitter with the receiver's IR sensor and by building an IR tent to cut out any interference. Sticking the IR emitter directly over the IR receiver and a stick-on style IR emitter might be worth trying. (Worthington Distributors sells stick-on style IR emitters many TiVo owners like.)
Please let me know whether or not any of those steps help with 10069 reliability. If the 10069 code cannot be made reliable enough, then I am afraid you are stuck with using the slow 10068 code.
Again, for Samsung SIR-TS-360 owners stumbling across this post, you
must choose Yes for the
Enter Key setting, and the IR only vs. IR & RF receiver setting might also be important.