Hi,
I do that too, modifying existing action to suit my needs where appropriate, if I feel this is generic enough, then I post it on the forum. It's easy to see the trend and the needs, and future version of the standard set definitely benefit from such feedback.
I think the problem is that for standard actions to be useful and straight forward, Some kind of compromise needs to be done, else it will become too difficult to dive in Playmaker for newbies or else the number of action will grow up to a stupid amount of actions. Alex talekd about modifying the api to accomodate some known issues in actions scripts, so hopefully, this will definitely improve.
Bye,
Jean