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There was somewhere you can contact developers for this, but I can't find it right now. Either way, you would have to contact the developers to include support for such features.
So maybe Dj Hammers or someone else that maintains the openBVE software for Mac?
Dj Hammers and most of the people on this site develop FOR OpenBVE. There might be a developer here who develops OpenBVE, but I don't know who. You can search around on the OpenBVE site and see if there is a link to contact the developers of OpenBVE for inquires into implementing features.
Leezer3 develops OpenBVE I believe, you can contact him on BVE Worldwide website. He's a nice guy he sure will help you, I already talked to him a while ago regarding OpenBVE v1.5.1.2 and he helped a lot.
Try to upgrade to Sierra ( the latest version )