In my opinion, any unnecessary additions to tab notation actually makes it harder to read. I've borrowed the notation for slurs (hammers and pulls) and glissandos (slides) from classical notation and so rarely have to put any type of symbol (h,p,sl) under the tablature stave.
If you use the symbols that classical guitarists have developed over the last hundred years or so, you don't need to write t, i (or m), p, h, sl, etc. under the tab. An occasional symbol can help clarify certain phrases (brush skips, alternate string pulls, etc) but the use any unnecessary symbols will mean more for your brain to process and therefore slow you down.
I've noticed that hammers and pulls (slurs in classical notation) and slides (glissandos in classical notation) are usually written as slurs in most tabs published in the last few years. I can't understand why more contemporary banjo arrangers don't use the glissando symbol (dash) to notate slides. It would eliminate the need for all of the unnecessary symbols (h, p, and sl) and make the tabs easier to read.
It would be a great thing if we could standardize the tablature notation system but don't hold your breath...
Thanks... Mike