Feature handling Dummy encoding

stoch

Dataiku's category handling = Dummy encoding with dropping dummy option seems to be using a level with the least exposure/volume as a dummy.

Q1. Is there a way to set this dummy manually instead of Dataiku's default method? Want to avoid using category handling = custom preprocessing option.

Q2. Using Variable type = Categorical with Drop one dummy option on input variable of double type seems to be dropping 2 levels. For example, there are only 3 regression coefficients from a variable with 5 levels). I would of expected there would be 4 regression coefficients since 1 is used as a dummy). Does anyone know the reason for this?

Many thanks in advance.