It would be very useful to add hidden custom fields/gift-specific attributes for donation forms, so that we can track the donation form name for each NXT donation. Currently, the donation form name, donation page URL and receipt URL are are automatically added as a gift-specific attribute for Online Express donations, but not NXT. This is very helpful for analyzing the performance of each donation form.
Today we shipped a feature writing donation form name, referrer and transaction ID as custom fields. Read more here: https://webfiles-sc1.blackbaud.com/files/support/helpfiles/rex/content/en-au/content/bb-new-features.html?envid=t-Z-FEhKwLvkGVGjTCcbBMEA&entitlementTypes=don,reg,amdp,pin,rcpt,pdft,atren,r7-ct,ogsre,opzfm,$pco,rmema,reaia,ocr,pcomm,qrywr,pcwfd,qryur,retrb,rxlpa,ogops.
We've pulled this work into our Q4 plan - we'll be releasing an addition to donation forms where it will automatically write Donation Form Name, Donation Form Referrer (URL) and BBPSTransactionID to custom fields.
Because receipting is completed from within RENXT and not managed by the donation form, we will not be writing anything related to the receipt. I suggest you add a separate Idea for that in the Gifts category.