I would like to see a couple of improvements to the Excel add-in.
If you try to lay from Excel some, but not all, of the runners in the race, the trigger will not execute at all. An interim solution that I use is to have a placeholder bet on the runners that I don't actually want to bet on. So they get bets at $1.02 on 0.01% of the bankroll, with the bets cancelled at in-play. Those bets never get on.
It would be better to be able to lay on only some, but not all, of the runners in a race.
The other improvement I would like to see is to add two columns to a spreadsheet, eg for both back and lay triggers. I have found that trying to add a second column doesn't work. The numbers get put all over the place.