The betting configuration UI is still to be rewritten within the next 1-2 months, we'll make sure there is an easy way to setup raises like that in the new version. In the meantime you could try to use something like "0.75pot", that's already supported.
We'll allow more options to edit the game tree after the initial creation, adding actions is a bit complicated right now though. We'd either need to query the user for the line configuration of the added subtree or keep the initial configuration options around, which is currently not the case. But that's also planned once the sizing UI rewrite is complete.
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one more small thing: just above the range grid where it shows actions and frequencies right now it shows the raises in chips while everything else is in bbs, so can we please have the option to show them in bbs instead? would also be nice to say after the call like calls x bb (y%) instead of just saying calls (y%)
We'll change all action descriptions to big blind amounts to keep things consistent, and the call amount also makes sense I guess.
The all-in sizing: Not sure if we'd want three separate settings for this, adding all-ins for earlier streets is not a big deal in terms of tree size anyway. Maybe replace the current setting by an "Add all-in if the current stack-to-pot ratio is below x" option, do you think that would be sufficient?