Which wallet can import keys? Bitcoin core is too big, Blockchain is online and Electrum can only import but not generate.
Which lightweight wallet can do everything including manual fee?
Which lightweight wallet can do everything including manual fee?
I can only answer about Electrum not generating. It can generate, just click create new wallet and you will have a new seed and a new wallet. Electrum can create as many wallets as you like this way.
I don't know if Multibit Classic can import, but for sure it can generate as many wallets as you want there (version 0.5.19 I am talking about).
More experienced users can help you better.