is there a reason the BTC source address must be the same as the one specified in "Personal bitcoin address" as long as they are both part of the same HD seed? I just figured that you can not spend specific addresses in multibit HD (you can in electrum afaik) so if one creates an address in multibit HD, you are being presented one of your addresses, but you can not spend from this adress unless you load some BTC to exactly this address, can one not just send from any other address? might be a little confusing, just trying to figure out the idea behind this