The interactive objects on the type 1 tileset never really worked well or at all, so yes, you'll have to create your own. If you ever get your own server, go ahead and take a look at my
Atlantis code release, which includes custom interactive objects ("object" class and "-SystemCarry" WNPC, maybe more, can't remember). I assume you're working offline right now, so I can't really help with custom interactive objects with that, as you're limited to GS1.