You'll find that its really, really hard to handle all interactions in post by post. Not to mention overly convoluted. That only works IRL or over chats because you can get a quick answer, you think on your toes and the responses end up beingg shorter. To force that upon a player in a forum environment would be inane and quite frankly counter productive and stifling others creativity, I suggest you start to either get used to it or find a IRC playgroup wich would probobly suit you better. This is obviusly my opinion from my experience mostly, but forum RP's have a fdeffierent focus. its about collaborative storytelling rather then a GM deciding everything. Different mediums you see.