Thank you for your sympathy Mel. I was not able to set up a recurring gift/pledge with installments as bill me later, and after inquiring our consultant confirmed it is not an option. If it is installments, they have to give a credit card number.
Customization would just mean being able to add our hold harmless paragraph before they hit the submit button on the event registration form. I haven't hashed out round about options for doing this yet, but am very surprised they seem to have no way to add text of our own or a hyperlink on a donation or registration form. (But, I'm a newbie. Maybe I missed it somehow or didn't ask our consultant the right way??)
Regarding the security certification - it is a mutual responsibility in our case - blackbaud did set one up for us. But, there is a glitch due to a miskew in communication. It will get resolved, possibly at extra cost, but it is a shame we had to wait until the site was live before we were able to test it.