Hello, please see answers below...
- Is it possible to make custom fields date sensitive? (eg, shirts are only available to order until x date, after that the shirt option is not available)
No, you can't do this. You can make custom fields display conditional on selections of other custom fields... but not based on the current date.
- I'm assuming that when using paypal, the registration confirmation e-mail is only sent after paypal has confirmed a successful payment?
Correct. This is done using PayPal IPN.
- Would it be possible to allow the conditional options to allow a text field option?
Yes, you can have any custom field type (including text fields) display based on the selection of another field of type radio button, checkbox or dropdown. So the user selects YES, I am a member. Then a text field shows to enter their number.
- conditional charging options show the amount when picked. Without adding the amount to the end of every conditional option picked (in its "title"), is it possible for an amount field to appear beside or below a conditional priced item when it is picked.
We would recommend putting prices in the actual options text... so it is clear to users. After selecting an option, no price dynamically shows. On the final confirmation page (prior to going to PayPal), the user will see all options chosen and the price to be paid. All custom field additions are shown together as added cost.
As a side note, we'll be releasing a large new package 2.7 around September. One of the great changes in that upcoming package is a dynamic pricing display during registration. You can use it now as-is then upgrade once the newer version becomes available. You get free updates for one year
If you have other questions, let us know.