This is probably what would be best to encourage Ship to Ship fighting more instead of boarding via sword charge/ cannon launch to water. Basically, a means to raise and lower the Ladder.
THis was, as a matter of fact, a VERY old idea by the devs themselves. But, they couldn't be able to get back on the ship because the ladder was raised. But... what if there was a way to lower it from the bottom? Here is what I mean with this.
I mean, if one drops it and another boards that's a way around it, or if they forgot to raise the ladder, but then again this WOULD encourage either ramming more, cannon firing, or cannon ark landing.
Basically, this goes around the main problem with ship combat.