Text of TWiki forms is too small & hard to read; I do not find it accessible to all users. Also, the font size of default body text is at the limit (actually a bit too small for me.)
In return, too much screen real estate is used for cell padding, e.g. too muh scrolling is involved.
I haven't changed the fonts.
What forms do you mean? Bugs form?
Any form, also the Bugs form.
I am discarding this since there is not much support for this.