Here is a list of limitations of zerodha strem platform . This list will be updated on a continuous basis.
STRATEGY LIMITATIONS
Strategy creation does not have MATH functions which are otherwise available in Scan creation
Strategy creation does not have Period High / Period Low functions which are otherwise available in Scan creation
OffSet option is not available for indicators like RSI
Comment fields in the “Strategy” definition is required so that we can add comments relating to strategy construction and logic for building up the strategy.
SCAN LIMITATIONS
Copy Scan option should be available so that we can copy the existing scan to create new scan