The built in R console in RStudio is pretty decent, but a little underwhelming. For example, it would be great to have the same syntax highlighting provided from the editor. I saw https://github.com/randy3k/rice on Reddit the other day and have been playing around with it. While I have run into a couple issues, I have been able to debug them myself without too much time invested and in general have really enjoyed using it. It would be cool to able to swap the default R console in RStudio for other options like rice or Jupyter IRkernel or anything else that can execute R code. Alternatively, be able to choose to send R code to the new integrated terminal instead of the R console.
** side note: I think I should be able to just send lines in any code file to the integrated terminal regardless if it would actually execute or not