Support for existing Aria2 Endpoint

[vladzaharia]

Love Motrix as a concept, but I already have a centralized Aria2 instance which downloads directly to my NAS and feeds into automated pipelines, and is also on a gigabit connection from ISP to Docker container.

Since Motrix is essentially a frontend built on top of aria2, is it possible to expose an advanced option to use another aria2 JSON-RPC endpoint instead of the built-in one? I don't necessarily care about having the local one disabled (would be nice) but it would definitely be handy to have everything just connect to the centralized instance.

[midijohnny]

This would be a great feature to have, hope it can be implemented.

[redactedscribe]

In my case I'd rather use the aria2c.exe defined in my PATH rather than the bundled one, otherwise I have to manage firewall rules for two aria2 instances.