Hi Jugal Shah,
As far as I know, this could not be used as a widget in mashup builder.
As an alternative, could you consider to set a cron string in a textbox widget in your mashup and pass it as an input parameter to your customized service?
In your customized service, you could author it like:
Please let us know if this is not meeting your case.
I think that what Jugal want's it's the easy Scheduler entry, as for a normal user will be hard to decipher CRON string codification.
And Yes Jugal the answer it's no, there's no easy way to generate a CRON string for normal user, but of course using mashups you can build your own CRON scheduler string generator. If you don't want to support all the CRON string features shouldn't be that hard.