Yes that' right.Well, as I understand LFREQD is just the upper limit, programs will use the FREQD specified by the developer unless it's higher than LFREQD...
I suggest not to limit it on the MAST page.
For instance there could (and the will be ) cabs around using 300ms or 500ms H1 length. This way is not 100% safe to get the same results that developers intended their releases to deliver.
RateCNV 3200 as default for reverbs is not enough. There are reverbs around with much longer tails or even more.
For Pres/EQs/Consoles/... it could be even less. But again: It doesn't matter because developers don't keep 2s (including some padding space) kernels for a console or a an Eq.