There are a couple of problems with this as the Admin would have to do the same for the Non-Cals, but also as was addressed prior you will need to qualify what constitutes Calvinistic/Reformed to be allowed.
Many of the initial reformed did not hold to limited atonement (ie, Luther for example) so will you allow 4 pointers as well who are historically considered Reformed but not Calvinistic into the thread. Calvinistic ential nothing less than 5 points but it falls under the arch of Reformed beliefs.
THis is not trying to make it hard or complicated, but many Reformed are heavily divided over this..on the one hand some say 4 pointers are Reformed, and on the other you have those who state ONLY 5 pointers truly hold to Reformed beliefs.
And if I remember correctly (Don't quote me though as it has been a while for me since I was active here) but you are or were Primitive Baptist which is different than Calvinism (though kin to it somewhat). I could be wrong of course and might be thinking of another.
I agree though, it would be nice to have a forum where non-cals could go to talk about their doctrine without critique and harsh words, however ... I believe it is not the doctrines themselves (per-say) that is issue but the hearts of those whom are debating. Sometimes the person might be having a bad, sometimes something is read in such a way that it appeared to present something offensive, sometimes the other person IS just being offensive.
I know for me I have had many good debates and edification with my Reformed brothers in discussing differences, and other times I have been on the receiving end of antagonistic and rude remarks, and I have given in kind at times as well. Can such a thing as our own forums be.. possibly.. the real questions for such are 3:
1. who qualifies for the forums in question to be created (Cal or non)
2. attitudes within those forums
3. and if other people can refrain from jumping in, who do not qualify for being a part of it, and making remarks
Numbers 1 and 3 are most likely gonna be your biggest oppositions