This would be a very simple job to do, taking perhaps 30 minutes in total and would merely require the purchase of a single channel remote of the type seen on fleabay,LIKE THIS if the Ultimate Remote mod wasn't required. Obviously, the Ultimate Remote mod includes this function as a bonus because the remotes used have the required spare channel.
Perhaps that point could be made next door on the mirror thread to this one by somebody?
If anybody wants to do so when the brilliant boot opening mod becomes available but is not sure, it goes without saying that I'd be happy to help, either with instructions or actually doing the job