Thank you very much!
The next release will be imap-2004d, a maintenance release. imap-2004d is under a coding freeze for the upcoming Pine 4.63 release, and so your changes won't make it in in imap-2004d.
However, I'm doing some related performance improvements, as part of the imap-2005 work, to other drivers. Your changes, or a variants of these changes, will definitely be part of imap-2005.
Thanks again!
-- Mark --
http://staff.washington.edu/mrc Science does not emerge from voting, party politics, or public debate. Si vis pacem, para bellum.