Inputs for what sort of configuration? How would you interface with them?

I'm not quite sure I see how moving the jumpers to the main part of the board would provide for that possibility; at the very least you'd need a 2-way jumper to disconnect the IO pad as well as connecting GND, and I don't think there's room for that. 

OK, Perhaps I need to go read the spec before wasting any more of your time. I did give it a quick look but that was all. I am assuming that the pins can be used as GPIO and routed internally. 

As for 2-way jumper - the input is isolated when the end of the board is snapped off so you only need one split pad (jumper) just like the TTL format GND pin in your design.

As for what purpose it would have - perhaps set the gain of an amp or pre-scale a comparator, invert some output ??? whatever is possible to allow some flexibility to the OTP design so that you don't have to throw it in the bin and program another.

Please don't consider it a waste of time - feedback is hugely appreciated, particularly at this stage of the design.

I see what you mean now. It would require running two traces for each pin to the snap-off section, however, which would be a tight fit given the routing constraints around the mousebites.

I'll give it some thought, but I'm not certain it can be made to work with the routing constraints.

Have you looked at the description of the programmer, though? The intention is that you can test your designs in-circuit without having to commit the design permanently, before you program the device for good.

I looked at the breakout board and saw the solder links on pins 7, 8, 9 and thought they may be jumpers for setting an address or something. Then I thought it's a shame that the jumper pads break off with the extra pins. Then I read about your TTL chip format and realised they are for shifting the ground pin. 

Anyway, if you want to to have break off pins then it would be great if you could use the broken off pins for jumpers instead so that the loss of the extra pins doesn't render the associated gpio useless. ie move the chip up higher on the PCB and have jumpers below on the main part of the PCB that doesn't break off. Maybe V2.0

I work with VHDL/CPLD/FPGA and I normally like these development kits but I just can't think of any use for OPT chips and I don't have any clue about the IDE and what language is used (if any). I am very curious and watching from a distance wondering what these could be good for. 

As for connections ... I would be looking at a way to have simple connections on the edges of the breakout PCB so that it slides into a DIP adaptor and that DIP could probably go into a normal ZIF for programming. Perhaps castellations? The less there is to throw away the better not just from the point of view of cost but also time. Takes time to solder headers but a pre-made DIP adaptor could just have a new chip carrier slide in. 

Anyway some thoughts.

I'm not sure I follow about the jumpers, can you clarify? When shortening a breakout, the ground pin has to be moved in order to keep the convention of the lower left pin being ground on 7400 series ICs.

Regarding socketing, the plan is to make a socket that accepts the breakout board unsoldered, so you program and test it before you have to solder on headers.

I was calling the solder-able spit pad that you use for shifting the GND a jumper. 

What I was suggesting was that (for example) when you break off all the extra pins and move the GND, that the other GPIO's on the chip that previously went to the removed DIP pins can now be used as configuration inputs instead, just with the solder-able split pads like the GND. 

I don't know if this chip has input pullup resistors but they could be used and split pads can go to ground when soldered. These inputs could be one bit input to a LUT or something like that. Better than wasteing them all together.