VBScript between frames

There’s now a vbscript launch , that can occurs at the begining or at the end of a sequence.
For specific purpose, i would need to launch a vbscript beetween frames.
I know i can make an event per frame , but this is somehow a little bit annoying.
Moreover, a timer for leting this vbs (and subsequent commands) to occurs would be useful
(as the same way as delay between events)

Does this make sens ?