I want to make some suggestions too:
It would be nice you implement document themes: a set of formatting choices that can be applied to an entire document and includes theme colors, fonts and effects, usable in all three applications.
Second I would like to see text effects (outline, shadow, reflect, glow, etc.) that you can apply directly on the text of the document (no only in TextArt). I have some documents made in MS Office with that kind of effects, and when you open them in TextMaker those effects are not rendered.
That's all for now. Thank you for the apps and support.