So:

1. An address can have only 1 fund raiser active at a time asking for a particular desired currency? Otherwise, how do incoming funds get assigned to the correct fund raiser?
1. any Simple Sends in the desired currency to the issuer's address before the deadline will be treated as investments in the property? How does a sending user prevent a Simple Send from being associated with the fund-raiser?
1. a user cannot use a Simple Send that happens to be in the desired currency to the issuer's address for 24 hours after the deadline, even if it's for some other reason?

I think we need either another tx to send investment funds, or a mod to Simple Send to optionally identify the purpose.