I don't know how effective it really is but try getting enough guild tokens as Conjurer to buy the MND to DEX conversion trait. It converts 5 Mind into 5 Dexterity. Other than that all I can tell you is pump some points into DEX, not alot but some. Due to stat caps with your ranks there isn't alot of reason to dump all your points into just one or two stats, try to be diverse with it. Try viewing as what classes you'll play most and build around those. Now since you mentioned CON and THM I'd suggest focusing on mostly INT and MND, a good piece into VIT for obvious reasons, a fair amount into PIE for spell resistances, and then lastly DEX. If you think you'll be going on a crafting spree for awhile, write down your current stat values and do a respec. Take the points you get and just dump them into DEX and MND as those are the two stats Weaver depends on. When you're done, respec again and change your stats back to how you had them.
For more info on stats and such SE did write up an article: http://lodestone.finalfantasyxiv.com/pl/topics/detail?id=92e2a2ee13f174b5a6f5f658135e1bf4ab725f29
EDIT: Sorry, I didn't fully read the piece, I don't actually use the redistribute option much myself unless I'm doing alot of tweaking. Reading back over SE's article they mention the stats have minimal effect on your skills as a crafter but do have some influence. But I still suggest going primarily with whatever classes you use most then allocate some points into other areas for classes used but not as often as the others. Piety from my experience doesn't seem to have that great of an influence on much right now as Conjurer but at the same time we sadly can't do much nuking with our spells until the issues with resistances and SP is fixed. MP-wise it's just not efficient. Edited, Nov 11th 2010 5:28am by SamusKnight
FINAL FANTASY XIV Roleplayer
Sair Gammonari - Hyur Midlander Male - Conjurer (Somewhat retired.)
Mihana Zhralyia - Miqo'te Seeker of the Sun Female - Archer