Suggestion: Fill area (painting tool)

Hi.

I recently started using the FG map tools for painting a bit more than before. However, I missed a feature to easily create floors. We have to do this manually coping the squared tiles. That means we have great difficulty to create rounded floors, besides we can create round walls. That's because I opened an idea in the ideainformer requesting a "fill tool" in the paintings tools of FGU.

https://fgapp.idea.informer.com/proj/fgapp?ia=137377

But I would like to read some suggestions to work around this problem. How you create round floors with that squared tiles?