Our Company uses a non boeing W&B program, and another non Boeing performance program.
When i get the flight plan, and W&B final, I take a SWAG at what the V2 speed should be. If there is a big error somewhere, that usually makes me look closer at what has been handed to me., But, we also have one person reading the WTs to the captain as he enters the numbers, so we always have 2 sets of eyes looking at the data.
Just S L O W down a little!