Privateer 2 - Unofficial Patch problems


Hello all, first post and it's a request for aid!

I have the GOG version and have installed the Unofficial patch. Whilst all the thingamabobs work, it seems that this version of the game won't recognise the "+" and "-" keys on the keyboard. Which makes accelerating a no-go.

As you can imagine, this is rather... irritating.

I have tried remapping in DosBox but it didn't appear to take. I also don't know if the Patched version will recognise any bindings in DosBox.

Is there a way of rebinding or to change the darkening's config files to alter the assigned key functions?

Many thanks!