very nice.
Yes, having one is beneficial from a creative standpoint. Artwork is as tight as print and 4k allows you to benchmark how many pixels you can push in your applications aside from the technical things such as this.
And here are the file property settings that will solve this 4k scaling issue:
Ahh yes. It must be the scaling.
The older version of Timeline FX had windows that fit its contents. The new one is really messed up.