Yep, you can update the animation frames. Just use something like my.frame = run4; in the script for the 4th frame of the run animation. I'm not familiar with character animation, but the manual (and the community) will help you with that.

If there's one way to do it, there's always another.

Why not just try downloading the free 30-day trial version and see how it is. Then you can, if you like 3DGS, buy it. You don't have to have Pro edition right away. You can use Commercial, Extra, or even Standard edition for that. I'd recommend at least Extra (otherwise you'd get the A6 appearing in the corner from standard). Commercial has the most features for the money and the best buy.