Would be cool if TxBuilder could have a getter for the total fee as calculation on the current template

[stevenroose]

I think the title speaks for itself, but right now there is a "feerate" and "absolute fee" setter on txbuilder. I know it's probably not trivial to do in the current architecture, but it would be really cool if the txbuilder would have a getter that can tell you what the current total fee is.

[tnull]

+1, would be really handy.