Hi,
I believe Acme should not be extended such way. There already were a lot of proposals of commands to add in Acme.
If all of them were added we would have Acme with a size like LibreOffice and a tag on half of screen.
Here
bitbucket.org/santucco/rev I have placed quick-n-dirty external program for Acme that does the same like Rev command. It can't do only one - to move pointer to a next found position. Yes, Acme doesn't support setting of pointer position via filesystem. And I think this is a feature that can be considered for addition in Acme. At least in both of your extentions it is needed.
So let's extend Acme not by internal commands but filesystem extentions, may be new files, may be new messages for "ctl" files.
For example, for pointer it can be a message "pointer=addr" for "ctl" file.
P.S. For reasons unknown for me this mail did not reach the mailing list. This is a second attempt. Other my messages are published with a big timeout.