How to force NUCmer to use exact match instead of unique match?

Question

[nchuang]

I am trying to snip off the flanks of my query sequence when aligning to a reference sequence using Nucmer. I noticed that the alignment:

ACTAGGGAGGA
-----GGGGGA

gets trimmed at:

ACTAGGGA|GGA
-----GGG|GGA

when I want it to trim like:

ACTAG|GGAGGA
-----|GGGGGA

I have tried --maxmatch and --nosimplifiy but it doesn't seem to change the coordinates that it outputs in the .coords file. It has this similar issue with the 3' flank as well.