I have one, unless you put a brace between the stays you will have a lot of flex
the stays are a tad spongy to begin with....
they do ride great....
I would not add a tab, nor would i ever part with the hand job
IF you are seeking better braking, try adding a booster to stop flex...or try some pauls canti's
i did this for a while...they work great
I guess the point of the bike is to enjoy it (no matter what)
If you have the ability to keep as is - i would stay canti - and get a modern ti bike like a moots 29er, or a POTTs
I have a wound up fork on my ti mojo, a one off, that is 410mm (I think it is a mountain tandem version). I have also used an ingleheart fork on it 420mm, both were set up for canti's or V.
IF you had for instance an IBIS Silk Ti with and 1 1/8 head tube, i would add the tab, as the geometry is more in line with modern bikes.