It sounds like a convenience in theory, but it would have to be handled very carefully. Otherwise, you'd struggle with assembly since an accidental click might undo the work you just completed. If the shop were bigger, I'd say there could be another table that is just for disassembly. As it stands, though, the anvil works well for me. And try not to store extra parts on the table. If the only things on the table are the ones you are assembling right now, the glitching isn't an issue.
Wow, wrong place to reply. *facepalm* I am so stupid.
Anyway, as it's the right mouse button you usually work on with assembling your parts (to hold them and stick them together) you're not really that much in danger of making a mistake of hitting your sword (with the left mouse button) and disassembling it mistakenly. So for me, I don't think it'd be that much of a nuisance to have the crafting table as the disassembling table.