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If the developers of electron cash have malicious intent then they may get your btc from your private keys because it is NOT the official wallet by Electrum !
So I recommend you to transfer your btc to a new address, just to be on a safer side.
Thanks for the warning, I will be careful. Another option that crossed my mind. Cashing in everything and put it on my bank account. I already had an amount transferred in batches of a few hundred dollar into my bank account, it is a local trader who takes a very small profit margin.
But the BTC is doing very well at the moment, maybe I should wait a while. The BCH is only a fraction of that and it is not going anywhere, maybe I should try to claim it later. In this case greed can be bad.