No, sorry. There are not plans to change it.
Forest core is based in a pattern distribution, and there are tons of functions which depend of this.
From the multithread scattering process (which uses the pattern rows), to Camera clipping, etc. To change it, we basically should rewrite the core from scratch.
Although Forest includes other distribution modes (Reference, Path, etc), these are very different from the 'Image' mode. A new 'Random' mode would be too similar to 'Image'.