I also saw Electrum for LTC and DASH for example. Looks like they all share the same Python command interface. Does that mean that they are also capable to do the same things as Electrum BTC does?
Not necessarily.
NONE of the Electrum forks are created by the original Electrum Devs... they are all created by other people and may or may not support any features of the original Electrum... you would need to check with the Devs of each fork to see if it still works as intended.