Understand that those "extra ports" can also often disable the OEM functions, including the OEM remotes (which are required for proper operation for capturing VHS). The mod is not almost easily reversible, and sometimes not reversible at all.
So be wary.
There were at least 3 common mods done to the MV VHS/DVD models by college/HS sports facilities. The mod was done by common sports video production companies. The "Cowboy Remote" was popular at the time.
It's also a common sign that the unit was ridden hard, and has zero maintenance. I've seen more bad decks than good, which had this modification. Heads are very often shredded, and thus have tracking issues, and the decks garner F/C/B ratings on my deck grading scale.
Again, beware.