That’s a good idea. Won’t make it into the next update, but I’ll put that on the list for the next maintenance release after that. Should be fairly simple to provide some flag evaluation value similar to how button presses are handled currently in the API.
On a sidenote: during the Cyberpunk mod development I made some changes to the API, which will also come to the next regular vorpX build. I tried not to break anything, but you will at least have to recompile your mod/project for the next build.
If you coded a binding for a different language and transferred the VPX_PROP_… defines in vorpAPI.h for that, you will also have to update those. Just in case. Normally they are only used internally, but if you did something out of the ordinary, they have to match the changed ones. There was at least one bug with a duplicate value which had to be fixed, and I also might have changed two or three others.