add the fees to InstantX - Give people the option to pay for first class mail, vs. second class mail.
That's it!
So we would have a few different fee-permutations. How much would each cost?
1) user makes transaction
without darksend and
without Instant TX
2) user makes transaction
with darksend and
without Instant TX
3) user makes transaction without darksend and with Instant TX (oh wait, that's not possible, lol, needs to be denominated/mixed to be instant TXable, right?)
4) user makes transaction
with darksend and
with Instant TX