I am new and am keen on developing ReactOS.

I looked through the source of ReactOS, there are only 13 Nasm files.

A while ago (2 weeks I think) I mentioned RosAsm, it was shunned a bit though by some of the devs.

Anyway, I would prefer to develop in RosAsm rather than Nasm, I know how you guys feel about it stealing your name

but I prefer it to Nasm. (Syntax is cleaner)

 

So would it be possible for me to develop in RosAsm for ReactOS?

It does run under ReactOS so it's just a case of your acceptance.