So far it's demonstrated the ability to essentially understand anything (the past and the present; the future is not included - need to earn that one yourself), modify most things (emphasis so far is on traits) in a subtle manner exactly as intended and no more.
But. Is not "modification of perception" also how Lobotomy can be used (if fast enough, we may be able to outright delete combat memories)?
And is not speech and communication based on perception, to an extent (which is why using Lobotomy to communicate works)?
Lobotomy's limitations are that it does exactly what you want it to do (and not necessarily the spirit thereof), and doesn't work on Abnormalities directly. But can we use Lobotomy in a directed matter to cause our desired second-order effects?
extract from your memories to create creatures, places, or items
I would suggest we try and summon up our past cactus, then move to things like SP bullets (does it work on Grief?), and maybe even stuff like Pillars?
Lepidoptera, 1: Will this heal by Timeskip end, and if not 2: Would going on a Witch punching spree speed things up via Mimicry's Regeneration? Or perhaps 3: Ask Sayaka for help?
strong affection towards you from both halves of this pairing
I don't think this has been mentioned yet - what does affection have at all to do with whether abilities can be used in normal conditions? Flipping the question: What is different in DoSaM form that truly allows for use of more abilities (in particular, the Pairing side of things)?
Its strikes carry more force than an ordinary human could ever hope to bear
Does Uranium or "insert-horribly-explosive-chemical-here" count as a simple physical weapon?
If you think about it, a grenade is just a shell, ball bearings, an explosive and a trigger, and you can make a very bootleg gun using "rubber bands" (probably worse than bows and arrows though), or a sling (utility depends on skill, it's not easy to use with nonstandard projectiles)
Taking a stab at possible weapon choices (aside of attempting to use Mimicry to make our other weapons more effective):
A shield would actually be something nice, we can now attempt to block attacks, deflect blows to reduce force, and maybe even attempt to intercept attacks headed our allies' way. Depending on size, we can even use it at the same time as everything else, and C U T with the edge in zero range.
Depending on how the shapeshifting and brute strength works, a whip shifting into a lasso, or a net with nails might help with in scenarios where we really want to pin something down?
If we don't mind losing the ability to use our Spear of Light at the same time, we could also go for NT's Scythe, or perhaps a Hammer?
E: Regarding the vote, nothing in mind now lol. Lepi. Are you offering a vote to select which three characters get thrown into the same Sidestory somehow. Am I reading this right?