Need to review subj and define tasks (analysis, specifications, impls)
That's are really big one and frequently asked ehcancement so should be carefully designed prior to impl. So RFPL created as initially that is really task for discussion and planning.
Initially I'm thinking about some set of predefined effects which could be added by additional attributes for corresponding components events like:
which could be later expanded to use custom JS functions like mySlide to trigger some custom effect.