Dear Madhav, 
Rosen must have taken into account forms of medieval "living sanskrit" noted by Vopadeva in his Kalpadruma. 
Vopadeva lists, in stanza 265, cur-ki steye, with anubandha ki indicating that it is among the roots that "belong to the cur class only optionally":
Palsule, ed. of Kavikalpadruma of Vopadeva, Poona (sic) 1954, p. xxvii (Vopadeva's anubandhas), and p. 43 for stanza 265: a commentary explains: ki, corayati corati. 
Palsule's Concordance published in 1955 in the Bulletin of the Deccan College Research Institute lists cur on p. 46 as being accepted by all grammarians exclusively as belonging to the Xth class, except Vopadeva who accepts it in both the Ist and Xth class. 
I did not check what your namesake Madhava has to say about cur. 
But Melputtur Narayana Bhatta summarizes him in his brief comment on cur (p. 619 of Guruvayur edition):
cura steye / akāra uktyarthaḥ / ‘ṇicaś ca’ (AA 1.3.74) iti taṅ curāder neti mataṁ mādhavadūṣitam / tenobhayapaditvam eva / corayati, corayate’rtham / 
   ke cit sarvacurādīnām anityaṇyantatāṁ jaguḥ /
   yeṣāṁ vikalpacihnaṁ ( ? -cittaṁ ?) syāt teṣām eveti mādhavaḥ //
In addition, Narayana Bhatta gives cura steye / corati in his long appendix to the Dhatupatha, under drume’dhikā bhvādayaḥ. 
However, could one not have a perfect cucora even without accepting cura steye / corati? 
Best, 
Jan



 

On Tue, 21 Jul 2020 at 17:56, Madhav Deshpande via INDOLOGY <indology@list.indology.info> wrote:
In his book Radices Sanskritae, published in 1827 from Berlin, Frederick Rosen lists the root चुर् as occurring in the first and the 10th conjugations, and provides forms like चोरति/चोरयति and चुचोर/चोरयामास.
image.png
I have used the form चुचोर in one of my verses, and I wanted to know from other Vaiyākaraṇas if there is any evidence for the root चुर् in the first conjugation.  Perhaps, G.B. Palsule's concordance of the various versions of the Dhātupāṭha has some information. I couldn't find my copy of this book. Rosen does not list the source of his information.

Madhav M. Deshpande
Professor Emeritus, Sanskrit and Linguistics
University of Michigan, Ann Arbor, Michigan, USA
Senior Fellow, Oxford Center for Hindu Studies

[Residence: Campbell, California, USA]
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Jan E.M. Houben

Directeur d'Études, Professor of South Asian History and Philology

Sources et histoire de la tradition sanskrite

École Pratique des Hautes Études (EPHE, Paris Sciences et Lettres)

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https://ephe-sorbonne.academia.edu/JanEMHouben