To answer your question, we don’t support the import of Rubycritic mainly because this is the first time I hear about it. So thanks for reporting this.
I’ll therefore create a card in our various portals and see if some other Ruby developers are interested. If this is the case, then we will prioritize this shortly as the ROI is very high (the cost to support a new external linter is low on our side and the value is certainly high for Rubycritic users).
Would you be able to highlight a couple of features or rules that you particularly like in Rubycritic?