With the standard can I still use javascript?
Does Pro add the ability to send commands and feedback to devices using javascript?

[ - ] With the Device or Site License without "Pro" functionality you cannot use events:
EVENT_RECEIVE_TEXT
EVENT_RECEIVE_DATA

other script functions is work.

[ + ] With the Device or Site License with "Pro" functionality, you can use all the iRidium API

See more details

You can find information about prices in the "BUY" section of the iRidium mobile web site.
You can see the price-list and buy iRidium licenses by the prices for integrators only if you belong to the company working on the Automation market.

You can confirm the status of your company after going through Full Registration on the web site (available after the initial registration).