Shapeoko Speed/Feed chart for tooling not 0.25" diameter

I’ve been using the recommended Speeds/Feeds from this wonderful chart:
http://carbide3d.com/shapeoko/feedandspeed/

My question to the community is there any prorating or adjustments to these recommendations for smaller tooling diameter?

A different sized endmill will have a different chipload, so the numbers ought to be different.

We do have some numbers here: http://www.shapeoko.com/wiki/index.php/Materials — if you’re not disinclined towards commercial software, then G-wizard from the CNC Cookbook folks seems to be an excellent option.