I claim no special expertise, but this looks like an instance where you should invoke the init—initial forms—feature, since line breaks and paragraph starts are part of the document structure code and not of the font itself.

Additionally, you might want to consider a contextual alternate, too, for instances where the kaf appears after a space.

I'd say that visually this is better than the alternative (introducing a big white space to the right under the top of kaf. Optically, the margins are better aligned by allowing parts of some letters to intrude on the margins than by allowing white space to intrude into the text.

If you do want to affect this by kerning, you can do so contextually by increasing the right side spacing of the kaf glyph EXCEPT when preceded by any other glyph (including the wordspace glyph). Note, however, that this will also affect the kaf when it occurs at the beginning of any text run, e.g. change of font, change of direction.

This doesn't look bad. It looks as intended; a bit unbalanced, but intended. Anyway, think: if you really care of the Kaf going outwards, why wouldn't you worry of Meem, going inwards? Certain amount of "problems" gives special flavour, some kind of versimilitude to this sort of typefaces.

It means this looks better as described by John Hudson and Froo. Visually it also looks to me better but some times I I got confused so decided to ask here. I should leave it as it is.

Thanks.