How can i add this tool

[MartinW.Mcclary]

Using a round-nose router bit?

There are limited bit sizes in the Easel program. Is it feasible to add a round-nose router bit? I am thinking about 3/4 inch. Also can one use a 1/4" straight bit? Would go a lot faster for hollowing out areas versus the 1/8" straight bit. Having fun with the Easel program and simply wanting to expand some options. Thank you.

I myself would just select a straight bit with similar settings ( dia/length) and pretend it is a roundnose bit.