There’s no formal weighting assigned to coinholder input or any other input. Coinholders, ZCAP (managed by ZF), and ZAC (managed by ECC) will each be polled separately. The results provide insight into sentiment across different groups, but there’s no predefined formula for how each input is weighted.
Some of the current proposals give ZEC holders control over a portion of the Dev Fund. For example, the Community + Coinholder proposal allocates 12% of block rewards for coinholders to decide how and when the funds are distributed. That said, there’s nothing stopping anyone from introducing a proposal that gives coinholders 100% control over the Dev Fund. If that’s something you’d like to pursue, I’d be happy to help you formalize it into a ZIP so it can be considered alongside the other proposals.